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# 0-2-4

Under the Whyte notation for the classification of steam locomotives, 0-2-4 represents the wheel arrangement of no leading wheels, two powered driving wheels on one axle, and four trailing wheels on two axles. [1]

## Branch line

A branch line is a secondary railway line which branches off a more important through route, usually a main line.

## 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).

## Dundee and Newtyle Railway

The Dundee and Newtyle Railway opened in 1831 and was the first railway in the north of Scotland.

## Earl of Airlie (locomotive)

Earl of Airlie was an 1833 steam locomotive designed and built by J and C Carmichael for the 4ft 6in gauge Dundee and Newtyle Railway, with a 0-2-4 wheel arrangement and a tender.

## J and C Carmichael

J and C Carmichael was founded in 1810 at Ward Foundry, Session Street, Dundee, Scotland.

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.

## Standard-gauge railway

A standard-gauge railway is a railway with a track gauge of.

## Steam locomotive

A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam.

## 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.

## 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.

## Whyte notation

The Whyte notation is a classification method for steam locomotives, and some internal combustion locomotives and electric locomotives, by wheel arrangement.

## 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.