Solebar

Solebar
Beams running down the full length of each side of a railway-vehicle chassis, and onto which the body sides of the vehicle are mounted.
Spark Arrester ...

Solebar
Longitudinal main frame, outer member of carriage or wagon under-frame, usually of channel section.
Soleplate ...

Solebar Main longitudinal structural member of vehicle underframe which forms the extreme edges of the frame. Also known in the US as a "side sill".

See also: Siding, Passenger train, Signal, Frame, Track