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
B61F15/00—Axle-boxes
B61F15/02—Axle-boxes with journal bearings
B61F15/08—Axle-boxes with journal bearings the axle being slidable or tiltable in the bearings
B61F15/10—Axle-boxes with journal bearings the axle being slidable or tiltable in the bearings and having springs opposing such movements