I have a Stewart F7 that I have installed an MRC AD370 sound decoder in. It has run great now for over a month when suddenly tonight in the middle of running it suddenly acts like the direction control has been reversed. It was very strange. I was sitting here at my computer letting the train run slowly around my loop when it all of a sudden went from going forwards to running backwards. All of my other DCC equipped locomotives run correctly on the layout so it isn't a problem with the Digitrax system I have (a Zephyr). Not sure why it would suddenly reverse direction like that. And nothing I have tried has fixed it. I am seriously thinking about changing the NDOT bit on it to see if that helps any. BTW this loco came DCC ready with the NMRA plug.