 Electrical equipment was by Metropolitan-Vickers.Many early British trolleybuses were of 3-axle design, partly because of legislation which restricted the length of 2-axle designs and partly because of the difficulty of designing a back axle which could cope with the torque supplied by an electric motor.It took until 1954 for official attitudes to change, when Walsall gained permission to run long 2-axle trolleybuses, and it was the Sunbeam Trolleybus Company, by then owned by Guy, which built them.