Electronic reverser on Post War loco

The 2026 uses a 3 position e-unit (226E-35). I'm unable to fine a Lionel 8620 that matches your description. Some of Lionel's electronic e-units can be used as replacements for the mechanical ones, but we have to know which electronic board you have first.

If you want to learn more about these e-units, wiring them, and servicing them, a good start are these Lionel Service Documents that Olsen's and Lionel kindly hosts:

http://www.olsenstoy.com/searchcd31.htm?itm=615

https://www.lionelsupport.com/...nt1to9/1Complete.pdf (See section on e-units starting on PDF page 460)

The electronic reverse unit you have is for DC motors, you need one for AC motors.

Rockershovel posted:

...I have an #8620 4-4-2 ...

Is this your 8620?

This what Lionel uses for their modern AC powered engines. Referred to as an ACMC. 

Pete

May be easier to put a mechanical E-unit back into it. Even if you've got to refurbish one. I've fixed my share of junker E-units and brought 'em back to life. Not too hard........

CJ Meyers posted:

May be easier to put a mechanical E-unit back into it. Even if you've got to refurbish one. I've fixed my share of junker E-units and brought 'em back to life. Not too hard........

Not too hard if you have 2 1/2 hands.  It helps to have a retainer ring spreader for the extra 1/2 hand.

Alan