(under subclass 2) Subject matter which further includes an electrical or magnetic actuator to influence said means to change the rotational velocity. [figure] [caption]In combination with ratio changing transmission including a movable member, a plurality of control elements each having a first part adapted to assume a plurality of positions; and a second part movable under fluid pressure to a position determined by the position of the first part, means whereby a first one of said control elements moves said movable member, the second one being operable through the instrumentality of the second part of the first control element. The invention defined by claim 1 together with a solenoid associated with each of said control elements, an electric circuit and motor to drive said transmission, said solenoids being energized by branch circuits and a rotatable cam whereby the one or the other of said control elements may be operable.