My Williams Santa Fe F-unit has begun to blow its horn spontaneously after operating for a few minutes. If I turn off the power and reverse the locomotive the horn goes silent until I sequence it forward and the horn blares again. If I shut the unit down and wait a minute or two , the locomotive goes forward with no horn--for a few minutes-- and then starts sounding again! The power source is a Variac transformed down to 24 volts and has no whistle button! WTF is going on. I might remove the shell and disconnect the horn--as long as I don't screw so nothing else up.
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