Cab (locomotive)

The cab, crew compartment or driver's compartment of a locomotive, or a self-propelled rail vehicle, is the part housing the train driver or engineer, the fireman or driver's assistant (secondman) (if any), and the controls necessary for the locomotive's, or self-propelled rail vehicle's, operation.

On steam locomotives, the cab is normally located to the rear of the firebox, although steam locomotives have sometimes been constructed in a cab forward configuration.

The cab, or crew or driver's compartment of a diesel or electric locomotive will usually be found either inside a cabin attached to a hood unit or cowl unit locomotive, or forming one of the structural elements of a cab unit locomotive.

The former arrangement is now the norm in North America for all types of diesel or electric locomotives. In Europe, most modern locomotives are cab units with two cabs, one at each end. However, the locomotives powering some high speed European trains are normally cab units with one cab, and European shunting locomotives are usually hood units.

On self-propelled rail vehicles, the cab may be at one or both ends.

In addition to the locomotive controls, a cab will typically be fitted with windshields, rectangular side windows, crew seats, heating, and sometimes radios, air conditioning and toilets.

Different types of locomotive cabs are:

The earliest locomotives, such as Stephenson's Rocket, had no cab; the locomotive controls and a footplate for the crew were simply left open to the elements. However, to protect locomotive crews against adverse weather conditions, locomotives gradually came to be equipped with a roof and protective walls, and the expression "cab" refers to the cabin created by such an arrangement.

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