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[quote user="UP 4-12-2"] Also--UP's 4-12-2's were never modernized with roller bearings (other than on the Gresley gear of some) becaue Otto Jabelman decided he absolutely hated them, and spent much of his career trying to get rid of them or replace them--even basically ignored potential U.S. government war-era funding for roller bearings which would have dramatically upgraded their performance and especially their durability.  [/quote] I never read Jabelman was against roller-bearings, huh? Something mixed here with tales from Southern Pacific? [quote user="UP 4-12-2"] Because they never received some "modern" improvements, we'll never know what the real potential of those engines might have been.  As engine 9000 was tested in 1926, peak horsepower was 4917 indicated at the cylinders at 37 mph (reported in UP Type, Vol. I) and later improved versions most certainly did better--but there's no data regarding how much better the later versions performed.  What a shame. John [/quote] A real improvement  was the T1-Texas. One Cyl. less, but a good 1000hp more than the 9000-class, The UP got finally rid of all this 3-cyl.-maintance-horror by designing the Chally.   Cheers lars
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