great the I would now try a conventional reset with transformer only. power up to around 10 volts and then wait a minute or so. the 1 W 5B in I second intervals, if reset works you'll get 2 whistle toot's. if that happens then power down an power up again and try running the engine in convention, using the direction button !
Sounds like there might be hope yet !
also the 1 whistle and five bells must be done in 1 second interval's or it will not work, you might have to play with it to get it.
Good luck!
Alan