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I purchased a set of Athern HO Genesis F3-A & B units (G25281A & G25281B with sound) from an estate sale and they are in "fine" condition. My problem is that the "B" unit (not a dummy) is powered and moves in the opposite direction of the "A" unit. As I am not an experienced HO train modeler, I have never seen this before. I am hoping there is a simple answer to this dilemma. I would really appreciate any help. Thanks in advance!