Originally Posted by TrainsRMe:
Roy Boy: Can't wait to see how that B-unit comes out. Did you swap out the A-unit's motor for a later motor having rubber traction tires?? My 21 can pull only about 3 cars with the dummy A-unit before the wheels slip.
The A unit is powered by two Williams China drive motors. Since Marx 21's are the same size as Lionel 2333, I could not resist.