Proto 2 has jerky operation with speed control on..off operation is smooth.
Conventional operation... I used two different transformers with same results...track and wheels are clean..lube is good..no binding. Ran another Proto 2 engine in the same area with no problem.
I cleaned the speed sensor..using a BCR 2... cleaned the tether end and engine socket.
I did a search and could not find any relative information that I can use. No downloading here. I am mainly a pre/post war operator.
Thanks
Fendermain