Tomlinson, specifically both rollers are supplying power to the engine full time and have no relation to what direction the engine is traveling. Actually the main purpose of having two sets of rollers is to bridge gaps where there is no power so the engine will keep going. It is possible on some switches (crossovers) for both rollers to be on a dead spot however. This problem has lessened by some more expensive engines having two double rollers, i.e. there are four rollers on the track.
Dennis
Thanks to you both. Obviously, I assumed that the rollers were connected individually to the forward and reverse motors. My engines are still too shiny and new for me to take a screw driver to them and explore their inner workings. But I know that day will come :-}
TRRR
