Abstract: Apparatus is provided for controlling the speed of a vehicle, especially vehicles of a railway train, wherein acceleration-imparting mechanisms associated with the wheels are adjusted on an individual basis by comparison of tangential speed and desired speed by the use of sensors to maintain the tangential speeds of the wheels equal to each other, and equal to a predetermined value. The technique may be employed in either the braking or the propulsion mode of operation, or in both modes, and allows commanded rates of vehicle acceleration to be realized to the greatest possible extent.

Abstract: A variable displacement cylindrical pump is provided having a sectional housing and a cam plate having trunnions and trunnion bearings. A first generally annular pump housing section is provided having oppositely disposed recesses formed in its inner periphery that have semi-circular portions at one end for axially receiving the cam plate trunnions and trunnion bearings. The trunnion bearings are secured in their recesses by the assembly of a second adjoining pump section housing and by biasing springs disposed between the trunnion bearings and the second housing section.