Reply to "Atlas O 0-6-0 Steam Switcher Questions - and Learning"

I've found that when I run into one like this, setting it aside for a spell and coming back to it usually results in progress.  There are also many times where just the trim where railings or piping come through the shell block the chassis from separating.  You just have to look for them and deal with them once you figure out what is holding up the works.  On larger articulated models, many times the front articulated power truck has to come off first.