Railroad track: railway rack made
of parallel steel rails laid on wooden ties.
Rail: set of steel bars placed end to end in two parallel lines.
Fishplate bolt: piece of steel with a head at one end and threaded
at the other, used in conjunction with a nut to connect the rails of
a railway track.
Spike: curved piece of metal used to attach the base plate pad
to the rail.
Tie: wooden plank laid perpendicular to and beneath the rails.
Tie plate: piece of metal that supports the rail.
Nut: piece of metal that holds a bolt in place.
Expansion space: space left between the rails to allow expansion
when the temperature rises.