Glen,
Mine has the insulated drivers on the firemans side (Left side of the locomotive viewing the locomotive from the rear of the cab.
If you hunt around there are some notes on this locomotive somewhere on Zealot. the locomotives were sold for a long time, and the quality of the wheels motors and gears improved over time. the first one I got was an early version, it had brass tires on the wheels, lower quality gears and a poor motor. It got a repalcement motor, and the NWSL regear kit. If I remember the regear kit took some fussing with to get it right.
The second one I got , was a late model, it had a good quality can motor, better gears, and I built the mechanism up stock, except for adding electrical pick up to the insulated side of the locomotive and tender. Cosmetically, I shortened the extended smoke box, and lowered the boiler by altering the cylinder saddle
in spite of being built mechanically stock the second unit performed better. any queations, feel free to ask, and check out my HOn3 engine shops thread, as most of my tricks are documented in there.
Bill Nelson