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truck and trackclick to hear

The most up-to-date subway trucks ride on tires, which provide fast acceleration and little noise or vibration.
truck and track invert runway running rail guiding and current bar inflated guiding tire inflated carrying tire steel safety wheel sliding block

invert click to hear

Thick concrete foundation for the tracks.

runway click to hear

Metal or concrete track that is fixed to the invert on which the tires roll.

running rail click to hear

Regular railroad rail for the steel safety wheel to roll on in the event the tire deflates; it also receives the traction current from the return shoe.

guiding and current bar click to hear

Metal bar against which the guiding tire rolls; it also supplies the traction current.

inflated guiding tire click to hear

Tire mounted at right angles to the carrying tire; it rolls against the guiding bar to guide the truck.

inflated carrying tire click to hear

Nitrogen-filled tire that supports and conveys the car.

steel safety wheel click to hear

Auxiliary regular train wheel that comes in contact with the running rail in the event the tire deflates and during switching.

sliding block click to hear

Shoe taking the current from the guiding and current bar.