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The H9 and H10 had such minor differences that unless you are a steam expert you cannot tell them apart. The brass one I have is listed as H9/H10 on the box.
BLI has a whole stable of PRR steam they've done in HO - K4s, I1sa, H10s, J1/J1a, T1 and the S2 but, yeah, if any I'd guess the K4s would be next. It would sure shut up a lot of PRR fans. But a good I1sa would be fantastic. Unfortunately, the H10s was mostly a Lines West engine, at least initially. They did migrate east as steam faded. The H8 and H9 were more common in the East as far as i can tell.
Besides, if BLI actually made a decent-running RTR K4 then 30% of the thread traffic on the Railwire would dry up!
I would actually prefer a short of regular tender with the M1s. I can do without the sound and the short tenders will run round sharper curves. Same with the K4.
Very few M1s pulled shorter tenders after World War II... My humble opinion is that the 210F75 is part of what makes the M1 the "mountain." As an SPF, I'm sure you know that it was Pennsy's M1 class that were first called "mountains."But for your purposes, Bob, BLI's description says it can handle 9.75" radius curves. It probably won't look so good doing it, but hey... If they'd have gone with the welded coast-to-coast with the 8-wheeled trucks, I imagine that would have been a higher minimum radius.Although I want mine with bells and whistles (literally), I know there's a market for DC and quiet only.