The present disclosure relates to an actuator for controlling a wheelset of a rail vehicle comprising: an axle casing for fastening to an undercarriage or to a wheelset bearing housing of the rail vehicle; a synchronized cylinder that is provided in the axle casing and that comprises a piston surface that has a piston rod passing through the axle casing at each of its two areal sides; and a housing that is movable in accordance with a movement of the synchronized cylinder with respect to the axle casing, wherein a piston spring element that connects a respective piston rod to the housing is arranged at the end of the respective piston rod remote from the piston surface.