The inner two axles of each car were fitted with a motor, and adhesion was improved by making the bogies asymmetric. The wheelbase of each bogie was , but the pivot point was from the front axle, resulting in 58 per cent of the weight of the car being used for adhesion. All of the trains were fitted with Crompton Parkinson Type C200 motors, which had been specially designed to fit in the limited space available. They were mounted onto the axle by a roller suspension sleeve. Each motor was rated at , and the car floors sloped upwards at the ends in order to give adequate clearance for the motorised bogies.