MY club runs gargraves track, magna trac does not work on this type of track. the problem is that the coefficient of friction between steel wheels and metal track is low, the rubber on the wheels has a much better COF and actually gets compressed providing a better footprint for torque to be transfer to the track, much like a Auto tire. A rubber tire locomotive will do a higher grade than a postwar steel wheel locomotive, I have seen real steam locomotives spin wheels, have you ever seen a diesel do so, i doubt it, the same with o gauge locomotives. Yes I don't like rubber tires but its something we have to put up with to pull our trains.
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