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The distance between the inner faces of the rails on a track.

A wheeled wagon or trolley onto which one or more pairs of wheels are fixed.

A series of connected railroad vehicles, such as coaches or freight cars.

The time interval between trains moving in the same direction on a particular route.

All the vehicles that move on a railway, including both powered and unpowered vehicles.

A device at the ends of a railroad car or locomotive that absorbs shock and coupling impact.

A mechanical device that connects rolling stock in a train.

The force that enables a train to move on a railway track.

The overhead wire system used to deliver electricity to a locomotive or train.

The layer of crushed rock or gravel upon which railway sleepers (ties) and track are laid.

The cross sectional shape of a railway rail.

A low-speed track section distinct from a running line or through route such as a main line.

An apparatus mounted on the roof of an electric train to collect power through contact with an overhead line.

A point at which a railway line crosses a road or path at the same level, as opposed to an overpass or tunnel.

A rectangular support for the rails in railroad tracks, typically made of wood, concrete, or steel.

A building from which railway signals and switches are controlled.

An incident in which a train comes off its rails.

An arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or crossings.

A tract of land on which railway tracks are laid, encompassing the ground underneath and to the sides of the rails.