Do you have an amp meter on your track?.....can you see if one is consuming more amps than the other at the same speed on the same section of track?...that’d give you a clue as to a mechanical or motor difference ,......is the slower one struggling?....if the slower one is consuming more amps, then something is forcing it to work harder.....if not, I’d lash them up with out a train first, faster one in front and see how they do on a short spurt,...if the amps don’t go through roof,...let her eat,...
Pat
