 There were differences in the implementation of the conversion, as the railway company was considering a plan to convert all of the gate stock cars to air-door operation, and this small batch provided an opportunity to experiment with what might be possible.On a gate stock train, each of the cars had its own conductor, who was responsible for the operation of the doors on that car.It was originally planned to work the air operated doors in a similar fashion, but the method adopted was for all the doors on a 3-car train to be controlled by a guard at the rear of the motor car.