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In railway terminology, the term "race gear" refers to the components of a railway vehicle passing passively over the rails, unlike those of the driving gear. Traditionally these are the wheels, axles, axle boxes, springs and the frame of the vehicle of a locomotive or railroad car.
The undercarriage of a modern railway vehicle comprises, in most cases, a bogie frame with two sets of wheels. However there are also wagons with simple axles (fixed or mobile) and even individual wheels.
Because locomotives no longer tend to have separate drive and transport axes (see wheel arrangement), as was common in steam locomotives, but they usually have bogies where all axles are driven, the term Career gear improperly replaces the term In some parts of the world.