The QJ was a type of heavy freight steam locomotive used by China Railways.
The Improved Mobile Telephone Service (IMTS) was a pre-cellular VHF/UHF radio system that links to the PSTN.
The J Nassau Street Local and Z Nassau Street Express (earlier Jamaica Express and displayed as Jamaica Local/Express on the R160 cars) are two rapid transit services in the B Division of the New York City Subway.
The Quarterly Journal of Austrian Economics is a quarterly peer-reviewed academic journal covering heterodox economics published by the Ludwig von Mises Institute.
The Quarterly Journal of Economics is a peer-reviewed academic journal published by the Oxford University Press.