I have a question. Why do some of my Locos run faster in reverse? In particular, I have two AF 290's that I rebuilt in accordance with Dave's AF trains Videos. I followed every step. Cleaning, polishing, lubrication, new fingers, finger tension, new brushes, brush springs, brush spring length at least 1", polished & cleaned commutator and grooves, Checked continuity, Isolated E Unit, and one 290 runs perfect in both directions and the other runs faster in reverse. I have noticed this with other locos I have as well. Do some motors run faster in different directions. I've dismantled this loco so many times I can do it blindfolded.