The Bedford OB model was a bus or coach chassis introduced in 1939.It was built by Bedford vehicles (a General Motors subsidiary) in the UK. The OB has a wheelbase of ft 6 in (m) and is a semi-forward control model designed to carry 26 to 29-passenger bodywork. It is fitted with a hp (kW) petrol engine and has a 4-speed gearbox and fully floating rear axle. The brakes are of the vacuum servo assisted hydraulic type.