Six experimental trolleybuses were bought in 1933, three of the chassis being ordered from the local firm of
Karrier, with the others being one each by
AEC,
Ransomes, Sims & Jefferies and
Sunbeam. The bodywork was by
Brush,
English Electric or
Park Royal. Following trials on the route to Almondbury, quantity orders totalling 134 were placed for the Karrier E6 chassis, with bodywork mostly from Park Royal, but also Brush or
Weymann, and these were delivered between 1934 and 1940. Several of these were given new
Roe bodies during 1950–54. Sixty-six trolleybuses bought between 1947 and 1951 had the
Sunbeam MS2 chassis (although badged as Karrier) with either Park Royal or Roe bodywork, and they were followed by 24
BUT 9641T with
East Lancs bodies between 1953 and 1957. The final trolleybus order – and the last order by a UK operator for three-axle trolleybuses – was for ten Sunbeam S7 with East Lancs bodywork, built in 1959. ==See also==