Wow, thirty miles?! My hat is off to you! And thanks for the valuable help!

Regards,
Charlie

I am dabbling with an original Digitrax Zephyr. About 16-18 years ago,I bought it from my cousin who was a Digitrax dealer. I had dismantled my basement layout, and moved into a small apartment with only enough room for a 4x6' oval. Basically, just used it in the DC mode for a couple of months and packed it away.
Over the years I bought a loco now and then, and a few decoders, mostly Digitrax, until recently, when I decided to build a new layout, and equip some with sound. Have a number of P2k GP9's/18's, Stewart F units, Bachmann F units, and added to the brass collection of B&O steam with this Bachmann EM1.
I should be able to stay pretty busy when i retire!

I got the tender straightened out as far as the trucks are concerned. Also have the 2 wire  harness to the driver wheels connected to the corresponding truck leads, and stopped there for tonight.
Took a 20 year hiatus from my model railroading, but followed from a distance at times. New to DCC for thr most part.

Thanks, you've given great info. Now I can continue the install of the decoder.

Ah! Thanks Rich!
I see the details on the tender wheels, now.  Never thought of checking the parts breakdown. 

Will still need some direction on the rest of the wiring, but probably won't get to it until later this evening.

I recently purchased a used (and damaged) B&O EM1.
The four wire harness connector was gone, and I ordered a universal 4 wire harness.
So far so good. Identified the motor's positive and negative connections, but have reached a mental stumbling block with other factors.
I am converting the factory decoder to a TSC Wow package. Now I have discovered that the tender trucks have complications, in that wheelsets were removed and installed haphazardly.
Some are reversed, I suspect.
So here are my questions:
Are both tender trucks supposed to pick up track voltage from the same rail, or are they staggered? If staggered, which rail does each truck pick up from?
And where do the tender truck leads connect on the Wow-Bac-3 #1902? I have the following link open but confusion exists...
https://tcsdcc.com/installation/ho-scale/bachmann-2-8-8-4-em1-steam/wsk-bac-3

Thanks in advance!
Charlie