B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
B61F3/00—Types of bogies
B61F3/02—Types of bogies with more than one axle
B61F3/04—Types of bogies with more than one axle with driven axles or wheels
B—PERFORMING OPERATIONS; TRANSPORTING
B61—RAILWAYS
B61C—LOCOMOTIVES; MOTOR RAILCARS
B61C9/00—Locomotives or motor railcars characterised by the type of transmission system used; Transmission systems specially adapted for locomotives or motor railcars
B61C9/38—Transmission systems in or for locomotives or motor railcars with electric motor propulsion