An motor with a high gearing rate but low speeds used to pull heavy loads with less stress which was used on DPR units form 1971 to 1989 and wore taken out of servers my 1990 after they became no longer needed as the explosives became more safer to transport and as well the cars designed to carry them.The main use on the motors was for hulling dangerous goods it has a top speed of 35mph and the high gearing to prevented problems with the train and its goods these motors pulled a max of 5 dangerous goods cars.
This is grat for slugs and craens usege. updated for TR12 SP1