A rail car mover for road-rail operation is enabled for shunting rail cars that are guided on two parallel rails. The rail car mover has a bogie and wheels which are mounted thereon and have rubber tires. Each wheel is assigned a bolt element, or a disk, which can be moved by way of an adjusting device from a first retracted position for the road mode in which the ground-side end face of the bolt element is located above the rolling level of the wheel, beyond the rolling level in the direction of the ground into a second deployed position for the rail mode in which the ground-side end face of the bolt element is located underneath the rolling level in such a way that the external circumferential faces of the bolt element of two wheels which are assigned to one another extend along the inner lateral edges and/or the outer lateral edges of the rails in order to guide the wheels.