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I posted this on another O Gauge Forum site, but I hope I'll get a better response on this one. 

I have 2 of the 3 units of the Union Pacific locomotive Cat Number 20-2331-1 produced in 2001.  Unfortunately I have the dummy B unit and the rear motorized A unit which only operates when tethered to the forward powered A unit.  My question is are there any other A units out there that will mate with my locomotive (which is PS2).  If so does anyone want to sell only the correct A power unit?  Many thanks.  Lew Schneider

 

 

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I have several MTH A-B-A sets of this vintage.  None of them are UP.  The problem is that all the command electronics are in the front A unit.  The rear A unit's motors, lights, etc., get all their commands through the tether from the front A unit.  If I understand the post, lewrail only has the rear A unit.  It does not have any command electronics.  In other words, the rear unit won't do anything without the front A unit tethered to it.  

I would suggest that you call a major MTH dealer and see if you can find a matching front A unit.  Several of these dealers advertise on the forum.  Another option is to have either a MTH or Lionel command system installed your A unit.  A third option is to take out the motors and run the rear A unit as a dummy.  NH Joe  

PS-2 Slave boards are available and also repairable I do have them.  PS-2 slaves are the same 5V or 3V.  PS-3 Slave is much different and does not work with PS-2.  MTH moved away from Slave PS-3.  For the original poster:  If you have the same vintage Powered A from another set you can use that to run and test your Slave A unit.   Also, you could upgrade your Slave A to full PS-32 or PS-3.  There by having a Leading A and dummy B.  You have choices here.  G

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