curved terminal rerailer

[full maxx]

good call old timer...it runs better the other way...but why

[OldTimer]

I don't know, full Maxx, and I can't tell long distance.  My guess is that there is a part of the mechanism that's a little tight and when it turns one way, it binds just a little.  Try taking the cars off the track and just running the engine for about 15 mins in each direction.  Vary the throttle setting every couple of minutes...you know, faster, slower, faster, slower, etc.  See what happens.  Good Luck.
Old Timer