encyclopedia

WHEEL CHOCK

A device placed beween the top of the rail and the rail vehicle wheel to prevent vehicle movement when brakes are not applied or are defective.

WHEEL FLANGE

In rail systems, a projecting edge or rim on the circumference of a steel wheel that is designed to keep the wheel on a rail. (TRB)

WHEEL TREAD

In rail systems, the exterior cylindrical or conical surface of a steel wheel that comes in contact with the rail. (TRB)

WHEELCHAIR LIFT

A device used to raise and lower a platform in a transit vehicle for accessibility by people with disabilities.