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I just purchased a 20-3075-1 MTH B&O Mikado from a reliable person.  When I got it is was very well packed and well maintained.  The MTH instruction book was not enclosed.  No problems.  I downloaded it.  At that point I noted the manual pictures did not look like the tender I had.  The pictures described volume control on the top of the tender it was on he bottom.  The pictures described a three or two rail option and mine only had a switch for smoke on/off.  Undeterred I pressed on as I have had issues with the manuals not reflecting the different release versions.  I placed it on the track and nothing, no lights, nada.  I tried to get DCS to recognize it as an MTH train and add it.  Nothing again.  I checked all the plugs reconnected the tender to the engine, nada.  Did this about 6 times then finally it jolted to life.  Cab chatter galore.  Runs well in basic operations.  DCS still does not recognize it.  Try factory reboot still not recognizing it.  Note some wires are not incredibly tight on my DCS (track still powered though).  So I turned off the power to rescrew the wires in and do so.  Turn power back in and it must be a railroad strike because the lights are off and again and the engine will not restart.  Before I take it to the MTH repair shop any guesses?  Any suggestions.  Thanks in advance.         

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I think even though you bought it from someone reliable I'd flip that dude over and see if the number on the bottom matches what you think you bought.
MTH manuals usually are pretty good as model to model goes.
You may have a PS1 engine on your hands.
You may have the wrong tender with the engine.
You may have to take the shell off to find out exactly what you do have.

David

This is a 20-3075-1, from 2002 vol 1 catalog.  If you look it up with the product finder, you get a different manual(later version) talking about 3/2 rail capability, showing a 3 volt system, etc.  But this is a 5 volt PS2 engine.  The battery is in the tender.   

 

You can use the manual for the 20-3086-1, 4-6-2 Heavy Pacific (2002 vol 2), as it properly shows the features and locations of switches of an early 5 volt engine.  I'd bet that the picture of the tender(with the shell off) showing the battery, looks very much like your's.  

20-3075-1

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