-Morgan
I'm not sure I know what you mean. Are you worried about losing your circus trains to the great concrete abyss? (Read floor)
Or did you mean something else?
Modeling B&O- Chessie Bob K. www.ssmrc.org
Jay
C-415 Build: https://imageshack.com/a/tShC/1
Other builds: https://imageshack.com/my/albums
Slow is smooth and smooth is slow. Such large trains require care on any curve.
I think of 50+ foot long cars is a massive train indeed. You might want to split that train up into two sections of 25+ cars and run em as two seperate trains. The first section should show green markers to show that there is a second section following.
Put your lightest cars on the rear half of the train, put the heaviest ones near the engines up front.
If you are increasing your power to pull faster out of the curve, your train will tip to the inside if things get too tight with it. You might want to consider maintaining a steady speed through the entire curve.
I dont know, 36" is massive in HO scale and should not stringline.