A door driver is provided on a railway house car for moving a railway car door between a locking position and a sliding position. The door driver includes a lever which is rotatably mounted on a structural member of the railway car. The door driver further includes a plurality of drivingly interconnected drive members, one of which is a driving member and another of which a driven member. The lever is drivingly connected to the driving member. The drive members have a plurality of gear teeth thereon and are rotatably mounted on the railway car with the gear teeth of at least one other drive member. When a force is exerted on the driving member, the driving member transmits that force to the driven member so the force capable of being exerted by the driven member is greater than the force exerted on the driving member. The door driver also includes means for connecting the railway car door to the driven member so that upon movement of the lever, the railway car door is urged between the sliding position and the locking position with a force that is greater than the force exerted on the lever.