Example embodiments relate to a regulating device for a working machine including at least four rubber wheels and a railway wheel unit in the area of a forward and rearward end, respectively, of the working machine, which each include at least two railway wheels and of which at least one can be raised and lowered by way of at least one power generator. The regulating device includes a position regulator by which the power generator, in a driving position, is automatically controllable to maintain the railway wheels on a predetermined perpendicular distance from an arbitrary reference point on the chassis of the working machine. Example embodiments also relate to a railway wheel device, a working machine and a method for regulating the railway wheel unit.
