Mark, thanks for the reply and the layout drawing. I might play around with something like that on the first level instead of the reversing loop. I was trying to avoid a second around the room loop on the first level, but heck if I already have 3 going across a bridge, what’s a third. Looks like I have something new to try. Greg said something along those lines too but that was before I said heck with it and did the big outer loops.
John, if I do keep that set of reverse loops, I’ll definitely be adding some sort of access hatch. It’ll likely live under avenues or buildings but will at least allow me to get right up in there. Maybe I need to just build an overhead gantry crane that’ll let me grab derailed engines like a crane game ;-)