solebar

noun

1. One of the longitudinal beams running along either side of a railway vehicle, onto which the bodywork is mounted, in passenger-carrying vehicles usually forming the side or the base of the floor.“The underframe, which has been designed to take buffing loads of 200 tons both on the centre coupler and on the retractable side buffers, consists of two centre girders from which cantilevers project to support the solebars, which in turn carry the bodyside structure.”