In 2007, my grandfather bought my grandmother an ALCO PA-1 A-B-A unit set (made by Lionel in 2007). While it has TMCC, it does not have the wireless tether. Nevertheless, it worked flawlessly until recently when after some new batteries for the RailSounds were put in (he doesn't like command control so he only runs it conventionally), the trailing B-Unit's wheels locked up. When I was trying to figure out what had happened, I noticed that the male tether from the trailing A-Unit to the B-Unit had 2 wires that had come loose and detached from it, so I am fairly sure that is the problem but I just wanted to see what other people thought.
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