Have you tried doing a reset?
In the manual for one of your engines, https://mthtrains.com/sites/de...tion/30dl17372i.pdf, look at pages starting at 24. On p. 34 there is a list of the different combination of clinks and clanks that indicate the various resets.
The process is somewhat convoluted, and it might take several attempts to get it done. I've also found that it works better if you stand on one foot and touch your nose while doing it. Lighting a candle and sprinkling some holy water may also help. 
