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"Quote""They could! Y-6 was permitted to run 50, and within this entire speed range tonnage ratings were higher than for Big Boy"High tonnage was given to the y6, and they were very efficent to manage it. But I think it is not correct to justify the engines just by the tonnage they pulled. Do Speeds beyond 10mph really account? Theoretically, at speeds more than 10mph, the BB is quite similar to the y6(b?) and has advantages above 30mph. Then, pretty much between the Alley and a Class A (by comparing their tractive efforts and hp tables). The average speed for an Evanston - Green River, or Laramie - G.R. run was more than 30mph, including stops. Extras would be faster. And they run could 70mph? Why? 'Cause just could do so ;-)UP just crossed a x-6-6-x with a x-8-8-x, concerning TE, Speed and HP, didn't they?lars
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