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Yeah, I guess I didn't have to contend with any of that. The largest locomotive the real RGS could handle was a K-27, so the Blackstone K-27 (which I've even operated on a 16" radius curve once) is my biggest customer. Brass for me is 4-6-0 or 2-8-0. No bigger K class engines for me (although I'd do some very morally questionable stuff if I could get that Blackstone K-28 into actual production).From my club layout experience, the larger K class engines can have shorting issues on tight radius curves and turnouts...so Kapton tape is your friend in those situations.
The Peco unifrogs are great , and you really don't need to power the frog . So far I've never had a stall there . Curve radius , I would go with 22 " radius . I did 18 " and wish I had gone bigger . Yes PFM United 2-8-2's are picky about curve radius Not much side to side axle movement . Now pretty much any Westside 2-8-2 CAN be made to run on 18 " curves with some easy mods . And I have a Sunset K-28 that will handle 18" curves . Mike