My curves are a hair broader than yours at 28". I don't have any steamers but
have thought if I ever get the chance that an Atlantic might work. The only thing
I would suggest is to switch to a diesel locomotive. An F unit should work. I have
a GP9 that does fine. If you really want steam you could go back a little farther
in time with 4-4-0 type. Finding some of this stuff in 2 rail before Christmas
might be a challenge though. Best of luck.
Geoff