Sorry if this is a stupid question

There are two ways of "reversing" a loco hauled train. One is where the arriving train stops short of a connection to a loop track next to the train. The loco uncouples from the train, draws forward, reverses over the points, proceeds along the loop track, rejoins the platform track at the other end and reverses back onto the train, couples up, brake test and there you go! If it's winter, don't forget the heater bag.

The other method doesn't need a loop. You just need a little loco siding at the exit end of the terminus, where you leave a loco. When the train arrives, the arriving loco uncouples, the loco in the siding at the other end of the platform backs onto the train and couples etc. When the train leaves, the loco left behind follows it out of the platform and goes into the siding. That's what they did on the Met with the electric locos at Liverpool St and Aldgate.

When the Metropolitan Railway extended to Aldgate, they installed drains in the four foot where the locos stopped to allow the hot condensing water to drain away quickly before refilling with cold. These drains joined the common sewer that led down to the Thames, which had the unfortunate side effect of when 1000 gallons of boiling hot water passed down, the sewage tended to well up in the lavatories of the houses that used that sewer. This didn't go down at all well, and the Metropolitan Railway was obliged to pay for its own sewer to the Thames!
(London's Metropolitan Railway by Alan A Jackson p.72)

I think everyone learns new things on here, Tony, and it's great to see LUL has fans so far from our shores. The only thing I know about Kentucky - aside from the obvious - is it is where Lexmark operate from. Thanks for the great answers, gentlemen.