Bachmann F7 "A" units. The "B" unit body is Tyco that I put on a Bachmann gutted F7 chassis. It isn't powered. The six axle passenger cars are Athearn. The curves on the inner loop are mostly 15" with a few 18".
https://www.youtube.com/watch?v=LTYvV9wNpVE (https://www.youtube.com/watch?v=LTYvV9wNpVE)
I have all of my passenger cars lighted now. I used ESU DCC light strips so I can turn them on and on with my E-Z Command.