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Ooops, UP4-12-2,my bad, I did not read your mail carefully enough. I understand Jabelman did not like roller-bearings. That he did not favor the 9000 is plausible, and valid, in my humble opinion, proved by the latter designs. The boiler and firebox of the 3900's in fact does not diifer so much from the 9000's, though the shape became different.  They were big improvements over the elderly "Moose's" , however. Otherwise, it was up to Lima und C&O to prove, 2 cyl. and 2 rods are up to such kind of piston forces, making the third cyl. somewhat obsolete.I meant of course 6000 indicated HP for the T1 (or 5400DBHP, if this is acceptable). Cheers,lars -edit-BTW,If you can think "Popular Mechanics" is a reliable source, I read there modern UP-engines had an expected life-time cycle of 3million miles or 30 years.
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