I don’t know if this is the problem, but I have a Lionel SD40T-2 built about the same year (6-38937). To avoid having the horn and crew talk activate when it is a trailing unit I can do one of two things: 1. Assign the train number to be less than 10 or 2. Run it as a trailing unit in the same direction as the lead unit. If I use a train ID above 9 or try to run it as a trailing unit whose direction is reversed relative to the lead unit, I get the horn and crew talk from both it and the lead unit.
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