 Once the concept had been proved to be reliable, the train was also used in passenger service.Besides the regenerative braking, the acceleration was found to be particularly smooth.When the decision was taken to proceed with the new system on the O and P stock, the test train was dismantled, and the equipment was fitted to three battery locomotives built by the Gloucester Railway Carriage and Wagon Company, which were part of a batch of nine vehicles supplied between 1936 and 1938.