I replaced it. I think it worked for a while then lost some control, whistle/bell, then speed etc. that is what I don't understand. My grandson was running it when this started. He is 9 so not into anything other than operation. I switched the locos and the other one didn't do anything. I think the wire may be the antenna because in a photo on line of the tiu it is facing a different direction than mine. I am pretty sure I would have noticed if I had broken it. There is no wire strands sticking out of the insulation. this is a heavy wire. it is near the two fuses that are together. the fuse that was blown is the one toward the middle of the board. it is with another fuse but the one toward the middle. these fuses are all marked 20 and are like mini auto fuses. after deleting the engines I tried start up with the one on the track it didn't do any sounds but It did go forward but that's all. I hope this helps to figure this out I have the new book but couldn't find anything like this in it.
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