A supporting cross piece--usually of wood or concrete on prototype railroads--that holds the rails of railroad track the proper distance apart (Gauge) and in proper alignment.

Wire, clip, or band used to attach the fabric to the top rail and line posts.

one of the cross braces that support the rails on a railway track; "the British call a railroad tie a sleeper"

In track construction, the cross members to which the rails are attached.

see Sleeper

Pieces of lumber laid under rails and to which those rails are attached.