Abstract: A railroad trailer chassis comprising two or more road axles, two or more rail axles operable to be moved between first and second positions, and a work unit. The railroad trailer chassis is operable to be driven or towed in a road mode when the two or rail axles are in their respective first positions. The railroad trailer chassis is operable to be driven or towed in a rail mode when the two or more rail axles are in their respective second positions. The work unit is operable to perform one or more railroad maintenance or operation functions when driven in the rail mode.

Abstract: A tow bar and hitch assembly for coupling together industrial carts so they can be towed in train-like fashion. A hitch member is fixed to the bed of a towing cart and receives a tow bar rotatably and slidingly supported by the bed of a towed cart. When not in use, the tow bar can be retracted to a stowed position beneath the towed cart by removing it from the hitch, rotating it to clear an abutment with a stop member which locks the tow bar against movement when extended, and then sliding the tow bar rearwardly.