I am at the point now where I'd like to add weight to my On30 Spectrum freight cars.
I've checked the NMRA stds and by interpolating between O, S, and On3 I've come up with having a weight of about 1.2oz + .5 for each inch of car length.

The problem now is how do I get the frame (or roof) separated from the body of the cars (box. reefer, etc).

There doesn't seem to be any "give" when I try to squeeze the sides.

Any tips on how to do this?

- Alan