You may have been correct.  I had a 2nd unit for parts, with an orange plug.  Swapped the necessary items, including the motor.  Huge difference!  Thanks for the assist!

I have a spectrum Ho scale 2-8-0.  Bought from ebait.  On DC it runs but I had to give it a push, the motor was revving high before it would move.  The chassis by itself rolls but has a slight wobble, and I wonder if this may be the cause of the motor revving high?

I have an older spectrum Ho scale 2-8-0.  Came with dcc ready and nmra 8 pin socket.  I purchased an esu loksound 58420, with 8 pin plug.  I did not wire a speaker yet, just plugged the decoder in and programmed it.  First there is no identification mark as to which direction to plug the decoder in.  Bachmann seems to fail in this area I'm told.  I used my judgement, programmed the decoder and it went thru all the motions but I cannot get the engine to move or react in any way.  Help!