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Britains' railways experimented with diesel traction through the early part of the 20th century, trying out a number of single car railbus type units. The GWR put the first successful railcars into service in the 1930s, combining AEC bus diesel engines and streamlined bodywork by Park Royal with railway coach structural engineering to create stylish express railcars. Drive was arranged through a mechanical transmission via cardan shafts and axle-mounted final driver and reversing gearboxes, a mechanical layout closely duplicated by the British Railways DMUs in the 1950s.To replace the 1950s DMUs British Rail moved to a hydraulic transmission system to create the Sprinter generation of DMUs from the mid-1980s, from which Heljan is now bringing the single-car class 153 units.