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Whyte notation

The Whyte notation for classifying steam locomotives by wheel arrangement was devised by Frederick Methvan Whyte and came into use in the early twentieth century, encouraged by an editorial in American Engineer and Railroad Journal (December 1900). [1]

147 relations: AAR wheel arrangement, Articulated locomotive, Bavarian BB II, Bogie, Boiler, Breitspurbahn, Cab forward, Central of Georgia "Big Apple", Chicago, Burlington and Quincy Railroad, Crampton locomotive, Driving wheel, Duplex locomotive, El Gobernador, Fireless locomotive, Frederick Methvan Whyte, Garratt, Gasoline, Kalmbach Publishing, Lartigue Monorail, Leading wheel, Lehigh Valley Railroad, Lima Locomotive Works, LMS Garratt, Mallet locomotive, Mason Bogie, Narrow-gauge railway, Patiala State Monorail Trainways, Planet (locomotive), PRR Q1, PRR Q2, PRR S1, PRR S2, PRR T1, Shay locomotive, Southern Pacific class AC-12, Southern Pacific class AC-4, Southern Pacific class AC-9, Southern Pacific class AM-2, Southern Pacific class GS-4, Southern Pacific Transportation Company, Steam locomotive, Steam turbine, Swiss locomotive and railcar classification, Tank locomotive, Tender (rail), Trailing wheel, UIC classification of locomotive axle arrangements, Union Pacific Big Boy, Union Pacific Railroad, USRA 0-6-0, ..., USRA 0-8-0, Wheel arrangement, 0-10-0, 0-10-2, 0-12-0, 0-2-2, 0-3-0, 0-4-0, 0-4-0+0-4-0, 0-4-2, 0-4-4-0, 0-4-4-2, 0-4-4T, 0-6-0, 0-6-0+0-6-0, 0-6-2, 0-6-4, 0-6-6-0, 0-8-0, 0-8-2, 0-8-4T, 0-8-8-0, 2-10-0, 2-10-10-2, 2-10-2, 2-10-4, 2-12-0, 2-12-2, 2-12-4, 2-2-0, 2-2-2, 2-2-4T, 2-4-0, 2-4-0+0-4-2, 2-4-2, 2-4-2+2-4-2, 2-4-4-0, 2-4-4-2, 2-4-4T, 2-6-0, 2-6-0+0-6-2, 2-6-2, 2-6-2+2-6-2, 2-6-4, 2-6-6, 2-6-6-0, 2-6-6-2, 2-6-6-4, 2-6-6-6, 2-6-8-0, 2-8-0, 2-8-0+0-8-2, 2-8-2, 2-8-2+2-8-2, 2-8-4, 2-8-6, 2-8-8-0, 2-8-8-2, 2-8-8-4, 2-8-8-8-2, 2-8-8-8-4, 4-10-0, 4-10-2, 4-12-2, 4-14-4, 4-2-0, 4-2-2, 4-2-4T, 4-4-0, 4-4-2 (locomotive), 4-4-2+2-4-4, 4-4-4, 4-4-4-4, 4-4-6-4, 4-6-0, 4-6-0+0-6-4, 4-6-2, 4-6-2+2-2-4, 4-6-2+2-6-4, 4-6-4, 4-6-4+4-6-4, 4-6-4-4, 4-6-6-2, 4-6-6-4, 4-8-0, 4-8-0+0-8-4, 4-8-2, 4-8-2+2-8-4, 4-8-4, 4-8-4+4-8-4, 4-8-6, 4-8-8-2, 4-8-8-4, 6-2-0, 6-4-4-6, 6-8-6, 8-8-8. Expand index (97 more) »

AAR wheel arrangement

The AAR wheel arrangement system is a method of classifying locomotive (or unit) wheel arrangements that was developed by the Association of American Railroads.

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Articulated locomotive

Articulated locomotive usually means a steam locomotive with one or more engine units which can move independent of the main frame.

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Bavarian BB II

The Bavarian Class BB II engines were Mallet saturated steam locomotives in the service of the Royal Bavarian State Railways (Königlich Bayerische Staats-Eisenbahnen).

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Bogie

A bogie (in some senses called a truck in American English) is a chassis or framework carrying wheels, attached to a vehicle, thus serving as a modular subassembly of wheels and axles.

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Boiler

A boiler is a closed vessel in which water or other fluid is heated.

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Breitspurbahn

The Breitspurbahn (translation: broad-gauge railway) was a planned broad-gauge railway, proposed by Adolf Hitler during the Nazi regime in Germany, supposed to run on 3-metre gauge track with double-deck coaches between major cities of Grossdeutschland, Hitler's expanded Germany.

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Cab forward

The term cab forward refers to various rail and road vehicle designs that place the driver's compartment substantially farther towards the front than is common practice.

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Central of Georgia "Big Apple"

The Central of Georgia Railway (CofG) K class (known as the "Big Apples") were a class of 4-8-4 steam locomotives produced by Lima Locomotive Works for the CofG during World War II.

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Chicago, Burlington and Quincy Railroad

The Chicago, Burlington and Quincy Railroad was a railroad that operated in the Midwestern United States.

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Crampton locomotive

A Crampton locomotive is a type of steam locomotive designed by Thomas Russell Crampton and built by various firms from 1846.

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Driving wheel

On a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotive's pistons (or turbine, in the case of a steam turbine locomotive).

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Duplex locomotive

A duplex locomotive is a steam locomotive that divides the driving force on its wheels by using two pairs of cylinders rigidly mounted to a single locomotive frame; it is not an articulated locomotive.

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El Gobernador

El Gobernador was a 4-10-0 steam locomotive built by Central Pacific Railroad at the railroad's Sacramento, California shops.

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Fireless locomotive

A fireless locomotive is a type of locomotive which uses reciprocating engines powered from a reservoir of compressed air or steam, which is filled at intervals from an external source.

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Frederick Methvan Whyte

Frederick Methvan Whyte (March 2, 1865 – 1941) was a mechanical engineer of Dutch background who worked for the New York Central in the United States.

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Garratt

A Garratt is a type of steam locomotive that is articulated into three parts.

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Gasoline

Gasoline, also known as petrol outside of North America, is a transparent, petroleum-derived liquid that is used primarily as a fuel in internal combustion engines.

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Kalmbach Publishing

Kalmbach Publishing Co. is an American publisher of books and magazines, many of them railroad-related.

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Lartigue Monorail

The Lartigue Monorail system was developed by the French engineer Charles Lartigue (1834–1907).

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Leading wheel

The leading wheel or leading axle or pilot wheel of a steam locomotive is an unpowered wheel or axle located in front of the driving wheels.

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Lehigh Valley Railroad

The Lehigh Valley Railroad was one of a number of railroads built in the northeastern United States primarily to haul anthracite coal.

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Lima Locomotive Works

Lima Locomotive Works was an American firm that manufactured railroad locomotives from the 1870s through the 1950s.

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LMS Garratt

The London Midland and Scottish Railway (LMS) Garratt was a class of Garratt 2-6-0+0-6-2 steam locomotive designed for heavy freight.

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Mallet locomotive

The Mallet Locomotive is a type of articulated steam railway locomotive, invented by the Swiss engineer Anatole Mallet (1837 - 1919).

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Mason Bogie

The Mason Bogie is a type of articulated steam locomotive suited for sharp curves and uneven track, once commonly used on narrow gauge lines in the United States.

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Narrow-gauge railway

A narrow-gauge railway (or narrow-gauge railroad) is a railway with a track gauge narrower than the of standard gauge railways.

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Patiala State Monorail Trainways

Patiala State Monorail Trainways (PSMT) was a unique rail-guided, partially road-borne railways system running in Patiala (British India) from 1907 to 1927.

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Planet (locomotive)

Planet was an early steam locomotive built in 1830 by Robert Stephenson and Company for the Liverpool and Manchester Railway.

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PRR Q1

The Pennsylvania Railroad's class Q1 comprised a single experimental steam locomotive for freight service, #6130, built in March 1942.

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PRR Q2

The Pennsylvania Railroad's class Q2 comprised one prototype and twenty-five production duplex steam locomotives of 4-4-6-4 wheel arrangement.

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PRR S1

The PRR S1 class steam locomotive (nicknamed "The Big Engine") was a single experimental locomotive, the longest and heaviest rigid frame reciprocating steam locomotive ever built.

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PRR S2

The Pennsylvania Railroad's class S2 was a steam turbine locomotive.

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PRR T1

The Pennsylvania Railroad's 52 T1 class duplex-drive 4-4-4-4 steam locomotives, introduced in 1942 (2 prototypes) and 1945-1946 (50 production), were their last steam locomotives built and their most controversial.

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Shay locomotive

The Shay locomotive was the most widely used geared steam locomotive.

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Southern Pacific class AC-12

Southern Pacific Railroad's AC-12 class of cab forward steam locomotives was the last class of steam locomotives ordered by Southern Pacific.

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Southern Pacific class AC-4

Southern Pacific Railroad's AC-4 class of steam locomotives was the first class of 4-8-8-2 cab forward locomotives.

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Southern Pacific class AC-9

The AC-9 was one of two Southern Pacific Railroad's articulated steam locomotive class that ran with a forward smokebox after 1920 (The other articulated locomotives fall into the cab-forward design).

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Southern Pacific class AM-2

Southern Pacific Company's AM-2 class of steam locomotives was Southern Pacific's (SP) only class of 4-6-6-2 locomotives ordered and built as cab forward locomotives.

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Southern Pacific class GS-4

The GS-4 was a streamlined 4-8-4 Northern type steam locomotive used on the Southern Pacific Company from 1941 to 1958.

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Southern Pacific Transportation Company

The Southern Pacific Transportation Company, earlier Southern Pacific Railroad and Southern Pacific Company, and usually called the Southern Pacific or (from the railroad's initials) Espee, was an American Class I railroad.

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Steam locomotive

A steam locomotive is a railway locomotive that produces its pulling power through a steam engine.

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Steam turbine

A steam turbine is a device that extracts thermal energy from pressurized steam and uses it to do mechanical work on a rotating output shaft.

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Swiss locomotive and railcar classification

For more than a century, the Swiss locomotive, multiple unit, motor coach and railcar classification system, in either its original or updated forms, has been used to name and classify the rolling stock operated on the railways of Switzerland.

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Tank locomotive

A tank locomotive or tank engine is a steam locomotive that carries its water in one or more on-board water tanks, instead of a more traditional tender.

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Tender (rail)

A tender or coal-car is a special rail vehicle hauled by a steam locomotive containing its fuel (wood, coal, or oil) and water.

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Trailing wheel

On a steam locomotive, a trailing wheel or trailing axle is generally an unpowered wheel or axle (wheelset) located behind the driving wheels.

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UIC classification of locomotive axle arrangements

The UIC classification of locomotive axle arrangements describes the wheel arrangement of locomotives, multiple units and trams.

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Union Pacific Big Boy

Big Boy is the popular name of the American Locomotive Company 4000-class 4-8-8-4 articulated, coal-fired, steam locomotives manufactured between 1941 and 1944 and operated by the Union Pacific Railroad until 1959.

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Union Pacific Railroad

The Union Pacific Railroad is a Class I line haul freight railroad that operates nearly 9,000 locomotives over 32,000 route-miles in 23 states west of Chicago, Illinois and New Orleans, Louisiana.

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USRA 0-6-0

The USRA 0-6-0 was a USRA standard class of steam locomotive designed under the control of the United States Railroad Administration, the nationalized railroad system in the United States during World War I. This was the standard light switcher of the USRA types, and was of 0-6-0 wheel arrangement in the Whyte notation, or "C" in UIC classification.

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USRA 0-8-0

The USRA 0-8-0 was a USRA standard class of steam locomotive designed under the control of the United States Railroad Administration, the nationalized railroad system in the United States during World War I. This was the standard heavy switcher of the USRA types, and was of 0-8-0 wheel arrangement in the Whyte notation, or "D" in UIC classification.

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Wheel arrangement

In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive.

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0-10-0

Under the Whyte notation for the classification of steam locomotives, 0-10-0 represents the wheel arrangement of no leading wheels, ten powered and coupled driving wheels on five axles, and no trailing wheels.

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0-10-2

Under the Whyte notation for the classification of steam locomotives, 0-10-2 represents the wheel arrangement of no leading wheels, ten powered and coupled driving wheels on five axles, and two trailing wheels on one axle (usually in a trailing truck).

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0-12-0

Under the Whyte notation for the classification of steam locomotives, 0-12-0 represents the wheel arrangement of no leading wheels, twelve powered and coupled driving wheels on six axles, and no trailing wheels.

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0-2-2

An 0-2-2, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is one that has two coupled driving wheels followed by two trailing wheels, with no leading wheels.

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0-3-0

0-3-0 is a type of wheel arrangement for a monorail steam locomotive.

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0-4-0

Under the Whyte notation for the classification of steam locomotives, 0-4-0 represents one of the simplest possible types, that with two axles and four coupled wheels, all of which are driven.

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0-4-0+0-4-0

In the Whyte notation for the classification of steam locomotives by wheel arrangement, the is an articulated locomotive, usually of the Garratt type.

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0-4-2

Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement with no leading wheels, four powered and coupled driving wheels on two axles, and two trailing wheels on one axle.

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0-4-4-0

In the Whyte notation for the classification of steam locomotive wheel arrangement, a 0-4-4-0 is a locomotive with no leading truck, two sets of four driving wheels, and no trailing truck.

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0-4-4-2

In Whyte notation for the classification of steam locomotives by wheel arrangement, an 0-4-4-2 is a locomotive that has no leading wheels, two sets of four driving wheels and two trailing wheels.

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0-4-4T

Under the Whyte notation for the classification of steam locomotives, 0-4-4 represents the wheel arrangement of no leading wheels, four powered and coupled driving wheels on two axles, and four trailing wheels on two axles.

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0-6-0

Under the Whyte notation for the classification of steam locomotives, 0-6-0 represents the wheel arrangement of no leading wheels, six powered and coupled driving wheels on three axles, and no trailing wheels.

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0-6-0+0-6-0

A 0-6-0+0-6-0 wheel arrangement in the Whyte notation for the classification of steam locomotives was used on Garratt, Meyer and Kitson-Meyer articulated locomotives.

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0-6-2

Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of no leading wheels, six powered and coupled driving wheels on three axles, and two trailing wheels on one axle.

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0-6-4

Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of no leading wheels, six powered and coupled driving wheels on three axles, and four trailing wheels on two axles.

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0-6-6-0

Under the Whyte notation for the classification of steam locomotives, a wheel arrangement refers to a locomotive with two pivoting engine units or bogies, each with six coupled driving wheels, mounted under a rigid locomotive frame without any leading wheels or trailing wheels.

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0-8-0

Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of no leading wheels, eight powered and coupled driving wheels on four axles, and no trailing wheels.

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0-8-2

Under the Whyte notation for the classification of steam locomotives, 0-8-2 represents the wheel arrangement of no leading wheels, eight powered and coupled driving wheels on four axles, and two trailing wheels on one axle (usually in a trailing truck).

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0-8-4T

Under the Whyte notation for the classification of steam locomotives, 0-8-4 represents the wheel arrangement of no leading wheels, eight powered and coupled driving wheels on four axles, and four trailing wheels on two axles (usually in a trailing bogie).

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0-8-8-0

In the Whyte notation for classifying the wheel arrangement of steam locomotives, an 0-8-8-0 is a locomotive with two sets of eight driving wheels and neither leading wheels nor trailing wheels.

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2-10-0

Under the Whyte notation for the classification of steam locomotives, 2-10-0 represents the wheel arrangement of two leading wheels on one axle, ten powered and coupled driving wheels on five axles, and no trailing wheels.

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2-10-10-2

Under the Whyte notation for the classification of steam locomotive wheel arrangements, a 2-10-10-2 is a locomotive with two leading wheels, two sets of ten driving wheels, and a pair of trailing wheels.

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2-10-2

Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of two leading wheels on one axle, usually in a leading truck, ten powered and coupled driving wheels on five axles, and two trailing wheels on one axle, usually in a trailing truck.

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2-10-4

Under the Whyte notation for the classification of steam locomotives, a 2-10-4 locomotive has two leading wheels, ten driving wheels (in other words, five driven axles), and four trailing wheels.

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2-12-0

Under the Whyte notation for the classification of steam locomotives, 2-12-0 represents the wheel arrangement of two leading wheels on one axle (usually in a leading truck), twelve powered and coupled driving wheels on six axles, and no trailing wheels.

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2-12-2

Under the Whyte notation for the classification of steam locomotives, 2-12-2 represents the wheel arrangement of two leading wheels on one axle (usually in a leading truck), twelve powered and coupled driving wheels on six axles, and two trailing wheels on one axle (usually in a trailing truck).

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2-12-4

In Whyte notation for the classification of steam locomotives by wheel arrangement, a 2-12-4 is a locomotive with one pair of unpowered leading wheels, followed by six pairs of powered driving wheels, and two pairs of unpowered trailing wheels.

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2-2-0

Under Whyte notation for the classification of steam locomotives, 2-2-0 represents the wheel arrangement of two leading wheels on one axle, two powered driving wheels on one axle, and no trailing wheels.

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2-2-2

Under the Whyte notation for the classification of steam locomotives, 2-2-2 represents the wheel arrangement of two leading wheels on one axle, two powered driving wheels on one axle, and two trailing wheels on one axle.

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2-2-4T

In Whyte notation, a 2-2-4T is a railroad steam locomotive that has two leading wheels followed by two coupled driving wheels and four trailing wheels.

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2-4-0

Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of two leading wheels on one axle, four powered and coupled driving wheels on two axles, and no trailing wheels.

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2-4-0+0-4-2

In the Whyte notation for the classification of steam locomotives by wheel arrangement, the is an articulated locomotive, usually of the Garratt type.

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2-4-2

Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of two leading wheels on one axle, four powered and coupled driving wheels on two axles, and two trailing wheels on one axle.

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2-4-2+2-4-2

In the Whyte notation for the classification of steam locomotives by wheel arrangement, the is a Garratt articulated locomotive.

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2-4-4-0

In the Whyte notation for the classification of steam locomotive wheel arrangement, a 2-4-4-0 is a locomotive with two leading truck, two sets of four driving wheels, and no trailing truck.

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2-4-4-2

In Whyte notation, 2-4-4-2 refers to a railroad steam locomotive that has two leading wheels followed by four coupled driving wheels, a second set of four coupled driving wheels, and two trailing wheels.

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2-4-4T

In Whyte notation, a 2-4-4 is a steam locomotive with two unpowered leading wheels followed by four powered driving wheels and four unpowered trailing wheels.

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2-6-0

Under the Whyte notation for the classification of steam locomotives, 2-6-0 represents the wheel arrangement of two leading wheels on one axle, usually in a leading truck, six powered and coupled driving wheels on three axles, and no trailing wheels.

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2-6-0+0-6-2

In the Whyte notation for the classification of steam locomotives by wheel arrangement, a is a Garratt articulated locomotive using a pair of 2-6-0 power units back to back, with the boiler and cab suspended between them.

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2-6-2

Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of two leading wheels, six coupled driving wheels and two trailing wheels.

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2-6-2+2-6-2

In the Whyte notation for the classification of steam locomotives by wheel arrangement, a is an articulated locomotive using a pair of power units back to back, with the boiler and cab suspended between them.

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2-6-4

Under the Whyte notation for the classification of steam locomotives, a locomotive has two leading wheels, six coupled driving wheels and four trailing wheels.

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2-6-6

In the Whyte notation for describing steam locomotive wheel arrangement, a 2-6-6 is a locomotive with a two-wheeled leading truck, six driving wheels, and a six-wheeled trailing truck.

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2-6-6-0

Under the Whyte notation for the classification of steam locomotives by wheel arrangement, a is a locomotive with one pair of unpowered leading wheels, followed by two sets of three pairs of powered driving wheels, and no trailing wheels.

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2-6-6-2

Under the Whyte notation for the classification of steam locomotives by wheel arrangement, a is a locomotive with one pair of unpowered leading wheels, followed by two sets of three pairs of powered driving wheels, and one pair of trailing wheels.

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2-6-6-4

In the Whyte notation for the classification of steam locomotive wheel arrangement, a 2-6-6-4 is a locomotive with a two-wheel leading truck, two sets of six driving wheels, and a four-wheel trailing truck.

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2-6-6-6

The 2-6-6-6 (in Whyte notation) is an articulated locomotive type with 2 leading wheels, two sets of six driving wheels and six trailing wheels. Only two classes of the 2-6-6-6 type were built.

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2-6-8-0

A 2-6-8-0 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, has two leading wheels, a set of six driving wheels, a set of eight driving wheels, and no trailing wheels.

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2-8-0

Under the Whyte notation for the classification of steam locomotives, 2-8-0 represents the wheel arrangement of two leading wheels on one axle, usually in a leading truck, eight powered and coupled driving wheels on four axles, and no trailing wheels.

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2-8-0+0-8-2

In the Whyte notation for the classification of steam locomotives by wheel arrangement, the is a Garratt articulated locomotive.

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2-8-2

Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of two leading wheels on one axle, usually in a leading truck, eight powered and coupled driving wheels on four axles, and two trailing wheels on one axle, also usually in a trailing truck.

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2-8-2+2-8-2

In the Whyte notation for the classification of steam locomotives by wheel arrangement, a is an articulated locomotive using a pair of power units back to back, with the boiler and cab suspended between them.

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2-8-4

In the Whyte notation, a 2-8-4 is a steam locomotive that has one unpowered leading axle, usually in a leading truck, followed by four powered and coupled driving axles, and two unpowered trailing axles, usually mounted in a bogie.

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2-8-6

In the Whyte notation for describing steam locomotive wheel arrangement, a 2-8-6 is a locomotive with a two-wheel leading truck, eight driving wheels, and a six-wheel trailing truck.

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2-8-8-0

In the Whyte notation for the classification of steam locomotives by wheel arrangement, a 2-8-8-0 is a locomotive with a two-wheel leading truck, two sets of eight driving wheels, and no trailing truck.

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2-8-8-2

. A 2-8-8-2, in the Whyte notation for describing steam locomotive wheel arrangements, is an articulated locomotive with a two-wheel leading truck, two sets of eight driving wheels, and a two-wheel trailing truck.

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2-8-8-4

Under the Whyte notation a 2-8-8-4 is a steam locomotive with two leading wheels, two sets of eight driving wheels, and a four-wheel trailing truck.

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2-8-8-8-2

Under the Whyte notation for the classification of steam locomotives, a 2-8-8-8-2 has two leading wheels, three sets of eight driving wheels, and two trailing wheels.

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2-8-8-8-4

Under the Whyte notation for the classification of steam locomotives, a 2-8-8-8-4 has two leading wheels, three sets of eight driving wheels, and four trailing wheels.

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4-10-0

Under the Whyte notation for the classification of steam locomotives, 4-10-0 represents the wheel arrangement of four leading wheels, ten powered and coupled driving wheels, and no trailing wheels.

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4-10-2

Under the Whyte notation for the classification of steam locomotives by wheel arrangement, represents the arrangement of four leading wheels on two axles, usually in a leading bogie, ten powered and coupled driving wheels on five axles, and two trailing wheels on one axle, usually in a trailing truck.

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4-12-2

Under the Whyte notation for the classification of steam locomotives, 4-12-2 represents the wheel arrangement of four leading wheels, twelve coupled driving wheels, and two trailing wheels.

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4-14-4

A 4-14-4, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with four leading wheels, fourteen coupled driving wheels (seven axles) in a rigid frame, and four trailing wheels.

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4-2-0

Under the Whyte notation for the classification of steam locomotives, 4-2-0 represents the wheel arrangement of four leading wheels on two axles, two powered and coupled driving wheels on one axle, and no trailing wheels.

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4-2-2

Under the Whyte notation for the classification of steam locomotives, 4-2-2 represents the wheel arrangement of four leading wheels on two axles, two powered driving wheels on one axle, and two trailing wheels on one axle.

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4-2-4T

In Whyte notation, a 4-2-4 is a steam locomotive that has a four-wheel leading truck, one powered driving axle and a four-wheel unpowered trailing truck.

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4-4-0

Under the Whyte notation for the classification of steam locomotives by wheel arrangement, represents the arrangement of four leading wheels on two axles, usually in a leading bogie, four powered and coupled driving wheels on two axles, and no trailing wheels.

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4-4-2 (locomotive)

A 4-4-2 Locomotive refers to the classification of locomotives under the Whyte notation for the classification of steam locomotives by wheel arrangement, where represents a configuration of four leading wheels on two axles, usually in a leading bogie with a single pivot point, four powered and coupled driving wheels on two axles giving tractive effort, and two trailing wheels on one axle, usually in a trailing truck which supports part of the weight of the boiler and firebox and gives the class its main improvement over the configuration.

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4-4-2+2-4-4

A 4-4-2+2-4-4, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a Garratt articulated locomotive.

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4-4-4

Under the Whyte notation for the classification of steam locomotives, 4-4-4 represents the wheel arrangement of four leading wheels on two axles, four powered and coupled driving wheels on two axles, and four trailing wheels on two axles.

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4-4-4-4

A 4-4-4-4 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, has a four-wheel leading truck, two sets of four driving wheels, and a four-wheel trailing truck.

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4-4-6-4

A 4-4-6-4, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is one that has four leading wheels followed by four coupled driving wheels, a second set of six coupled driving wheels and four trailing wheels.

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4-6-0

Under the Whyte notation for the classification of steam locomotives by wheel arrangement, represents the configuration of four leading wheels on two axles in a leading bogie, six powered and coupled driving wheels on three axles, and no trailing wheels.

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4-6-0+0-6-4

In the Whyte notation for the classification of steam locomotives by wheel arrangement, the is a Garratt articulated locomotive.

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4-6-2

In the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of four leading wheels on two axles, usually in a leading bogie, six powered and coupled driving wheels on three axles, and two trailing wheels on one axle, usually in a trailing truck.

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4-6-2+2-2-4

A 4-6-2+2-2-4, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is one with 4 leading wheels (two axles) followed by 6 coupled driving wheels (three axles) followed by 2 trailing wheels (one axle) with a second half with 2 leading wheels (one axle) followed by 2 driving wheels (one axle) followed by a final 4 trailing wheels (two axles).

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4-6-2+2-6-4

In the Whyte notation for the classification of steam locomotives by wheel arrangement, a is a Garratt or Union Garratt articulated locomotive using a pair of engine units back to back, with the boiler and cab suspended between them.

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4-6-4

Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of four leading wheels on two axles, usually in a leading truck, six powered and coupled driving wheels on three axles, and four trailing wheels on two axles, usually in a trailing truck.

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4-6-4+4-6-4

In the Whyte notation for the classification of steam locomotives by wheel arrangement, the is a Garratt articulated locomotive.

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4-6-4-4

In Whyte notation, a 4-6-4-4 is a railroad steam locomotive that has four leading wheels followed by six coupled driving wheels, a second set of four driving wheels and four trailing wheels.

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4-6-6-2

In Whyte notation, a 4-6-6-2 is a steam locomotive with four leading wheels (two axles) in an unpowered bogie at the front of the locomotive followed by two sets of driving wheels with six wheels each (three axles each), followed by two unpowered trailing wheels (one axle) at the rear of the locomotive.

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4-6-6-4

In Whyte notation, a 4-6-6-4 is a railroad steam locomotive that has four leading wheels followed by six coupled driving wheels, a second set of six driving wheels and four trailing wheels.

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4-8-0

Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of four leading wheels on two axles, usually in a leading truck, eight powered and coupled driving wheels on four axles, and no trailing wheels.

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4-8-0+0-8-4

In the Whyte notation for the classification of steam locomotives by wheel arrangement, the is a Garratt articulated locomotive.

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4-8-2

Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of four leading wheels on two axles, usually in a leading truck or bogie, eight powered and coupled driving wheels on four axles, and two trailing wheels on one axle, usually in a trailing truck.

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4-8-2+2-8-4

In the Whyte notation for the classification of steam locomotives by wheel arrangement, a is a Garratt articulated locomotive using a pair of engine units back to back, with the boiler and cab suspended between them.

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4-8-4

Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of four leading wheels on two axles, usually in a leading truck, eight powered and coupled driving wheels on four axles, and four trailing wheels on two axles, usually in a trailing truck.

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4-8-4+4-8-4

In the Whyte notation for the classification of steam locomotives by wheel arrangement, the is a Garratt articulated locomotive.

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4-8-6

Under the Whyte notation for the classification of steam locomotives, a 4-8-6 locomotive would have had four leading wheels, eight coupled driving wheels and six trailing wheels.

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4-8-8-2

Under the Whyte notation for the classification of steam locomotives, a 4-8-8-2 is a locomotive with four leading wheels, two sets of eight driving wheels, and a two-wheel trailing truck.

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4-8-8-4

In the Whyte notation for the classification of steam locomotives by wheel arrangement, a 4-8-8-4 is a locomotive with a four-wheel leading truck, two sets of eight driving wheels, and a four-wheel trailing truck.

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6-2-0

In the Whyte notation, a 6-2-0 is a railroad steam locomotive that has an unpowered three-axle leading truck followed by a single powered driving axle.

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6-4-4-6

A 6-4-4-6 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, is one with six leading wheels, two sets of four driving wheels, and six trailing wheels.

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6-8-6

Under the Whyte notation for the classification of steam locomotives by wheel arrangement, represents the arrangement of six (6) unpowered leading wheels arranged into a three-axle leading truck, eight (8) powered driving wheels, and six (6) unpowered trailing wheels arranged into a three-axle trailing truck.

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8-8-8

An 8-8-8, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is one with 8 leading wheels (four axles) followed by 8 coupled driving wheels (four axles) followed by 8 trailing wheels (four axles).

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Redirects here:

Configuration (locomotive parts), Whyte classification.

References

[1] https://en.wikipedia.org/wiki/Whyte_notation

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