British Rail Class 139 Pacerailer - prototype railbus built 1960s, by a private company. References External links AC Cars Railbus EM2 Locomotive Society – owners of Drewry railcar DB998901. Old Dalby Test Track site – Pictures of the Drewry car RDB998901 in action at BR's test track Wickham Railbus Group – owners of Wickham railbus DB999507. Train Testing site – Pictures of the testing and travels of the early railbuses Train Testing site – Pictures of LEV1 in the US departmentals.com The Railbus Trust – Working to protect the future of Single Car Railbuses and Second Generation DMU prototypes. Railbuses Railcars of the United Kingdom Bristol Commercial Vehicles D. Wickham and Company rolling stock Park Royal Vehicles multiple units AC vehicles Train-related introductions in 1950 Train-related introductions in 1978