B61B—RAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR
B61B5/00—Elevated railway systems without suspended vehicles
B61B5/02—Elevated railway systems without suspended vehicles with two or more rails
B61B5/025—Sub-floor conveyor systems, e.g. where the vehicle is above the ground and where the running gear and the propulsion device are located underground or in a tube.
B—PERFORMING OPERATIONS; TRANSPORTING
B61—RAILWAYS
B61B—RAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR