Well, if you cars use a card system, and the cars go into a yard to be
classified, make the rip track part of the move every once in a while. Do
the maintance then....clean wheels , check coupler height, etc etc. Do it
for all your rolling stock. Then everything goes through maintance. If
things need fixed, replaced, you will have a means/ system to take care of
all of it.

Joe Lofland
JJLModels