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[quote user="timz"]   All of them-- and just about all the unsurviving ones too. Mr Meislahn decided the A&S engine's center cyl was tilted 6 degrees; the SP 4-10-2s were 9.5 deg, and as I recall the 4-12-2s were too. [/quote] I believe that the UP 9000 and SP 4-10-2 needed that higher tilt angle because the center cylinder was connected to an axle much closer to the front of the engine (The second anxle, if I recall correctly). Also, if I may ask, where did you find the tilt angle for the A&S #12? I have copies of all archived paperwork for her from MOT and in all of that (and the internet) have not seen a measurement on the tilt of the center cylinder. It's also worth mentioning that most survivors of the N.American 3-cylinders use the Gresley valve gear for the inside cylinder (Baldwin 60000 does not). And according to this information from rgusrail.com, its no wonder that all equiped with gresely are tilted. [quote] Another feature of the Gresley design was the general need to angle the third cylinder so that the inner main rod would clear the first driver axle. On #9000, the incline was 9½°. [/quote] All for now, -S. Connor PS- Not all 3 cylinders used gresely valve gear. Gresely gear wore quickly and was not very suitable for high speeds. Many 3 cylinders (If not simplified to 2 cylinder operation) were rebuilt with Walshearts valve gear on the center cylinder, or had the gresely rebuilt with roller bearings. Some of the UP 9000's had this done to them, but none survived save the 9000, which was not altered. Now I believe the only 3 cylinder with "speacial" (Not gresely) valve gear for the 3rd cylinder is Baldwin 60000. Not sure what valve gear is used on that, though.
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