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If you have any significant load that is using a diode to produce DC, it will put a DC offset on the track.

The fact that it's triggering both the whistle and bell suggests it's either the transformer, track feed and track joint continuity, dirty wheels/rollers, or some internal flaw in the tender.

Do other locomotives have the problem? That would be my first test. Next test would be to swap out the transformer.
 
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