MTH A unit

Need more info, like, conventional, PS1, PS2, PS3, do you want to keep coupler operation, etc.

You could switch the 2 leads to each motor, assuming this unit has can motors.  This would work for PS1, PS2, PS3 and would have no effect whatsoever on the electronics.

It would have an effect on coupler operation.  Some PS versions, I believe, are programmable for direction on start-up options, which would preserve coupler operation and negate the need to rewire.

Rob:

Reversing the leads on the motors will not affect the couplers.  The original poster asked about an "A" unit, which indicates that he has a cab type diesel.  The front coupler will always be the one at the cab end, even though the engine runs "backwards" first.

The other question is this a Lead or Trailing A-unit?  If a trailing A-unit then it is driven from a slave board controlled by the Lead A-unit master board.

If you use DCS you can create a consist to do this.  If conventional operations, you just need to reverse motor leads on both motors.  G

If the engine is PS 2 or 3 you can set the startup direction with DCS. I'm not sure if it would hold for conventional operation afterwards. I can test that this weekend.

Swapping leads to the can motor is a definite fix tho.

NOTE: If running conventional, place the units close together and run them a few laps, see if they change distance much. If they rapidly change the gap, they are not good Consist candidates until one or the other is fixed.

Hard to say which one without performing the test against another engine.