Re: narrow gauge electrics

Nope they were separate operations.
Last time I was there S2 9068 (ex-B&O if memory serves) and SW9 48 (ex-West Pullman & Southern) switched the yard, but the electric trackage was separate. (S2 9017 went to scrap around 1987, and there was an S1 that sat in the engine facility in the early 80s I never got close to.)
Empire's facility was on an old GM&O branch, and also had a barge terminal on the Warrior River. Coal unloaded off the barge was loaded into a godawful assortment of bad-order cars including boxcars with the roof cut off) for transfer to the top of the tipple. (Coal was also delivered by ICG.) The standard-gauge engines spent the day switching the yard and hauling 2-3 loads at a time up the switchbacks.
The first visit I made down there, I hit it off with some of the crews, and from then on went pretty much where I wanted to in the yard. I never got access inside the coking facility where the electrics ran, but found a spot near the engine facility where you could get a couple of relatively clean views. The electrics appeared to haul in-process coke or slag or something - short trains of funky looking cars.
Maybe the high point was a standard-gauge / narrow-gauge diamond right by the engine shed.
Hard to believe 9068 was still working in '98.
Maybe it's time for a visit . . .
JAC