A trolleybus is a passenger vehicle that runs on a road using electricity from overhead cables, like a tram without rails. There are more than 60 in the museum, together with some diesel buses and other vehicles. The oldest date from the 1920s, but there is also a replica of a Cedes-Stoll from 1911. Most operated in towns and cities around Britain. Others come from Belgium, Canada, France, New Zealand, Portugal and South Africa. The makers of the electrical equipment include British Thomson Houston, English Electric, Metropolitan Vickers, Siemens, Vetra and Porsche. The diesel buses range from 1947 to 1988. Other vehicles include ‘tower waggons’ for getting access to overhead cables. All the vehicles are maintained in the livery of their operators. The mid-twentieth-century heyday of the trolleybus is also reflected in some reconstructed shop windows and a prefabricated house. The museum was opened by independent collectors and enthusiasts in 1971. It can be visited on special open days, when visitors can take a trolleybus around a circuit.