 There were 400 such vehicles on the roads in early 1931, but the following years saw many tramway systems replaced by trolleybuses.Bournemouth Corporation Tramways began that process in 1933, when they placed an order for 103 double-deck vehicles with Sunbeam, which were fitted with electrical equipment manufactured by British Thompson Houston (BTH) of Rugby.Sunbeam exported their trolleybuses to a number of countries.