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First of all, thank you Everybody for putting more info here!@BigJim:What is the grade at Blue Ridge, and how long is it? Do not have any sources for that, only for Sherman and Wasatch. However, if train speeds exceeds 10mph, both should have the ability to haul same weight . 3250 tons is not bad, maybe Y6 or some other could pull some more, but their TE-Table does not show it that clearly ( I only can rely to this, sorry for being blind on one eye! ) Most would pull far less. A "H7" was rated 2400tons, a Challenger 2100tons. To be honest, I am little bit confused on Y6 datas, you can help me for sure: I only have the TE-Table for the Y6, which Railway Man posted earlier on this thread, though I read higher values. The graph compares an "A", a "Y6b" with "Jawn Henry". It is likely therefore, it relates to the later, refined Y6b. It starts with 170.000lbs, and drops to 125.000@10mph. After it it smoothes down:100.000@20, 65000@30. Guess this is all simple expansion. Compound would lower the TE-Curve, right? However, builders specified starting TE was just 152.000 (simple) and 126.000lbs in compound mode. Read once, they had something around 190.000lbs (Massena's, Kings's thoughts?). Which one is true? And, the Y6 had certainly the abilities to run more than 50mph (short time?), but based on a day-in day-out schedule or at a 100mile run? Do not think it is a good idea. Maybe the later, refined Y6b could do so?@VAPEURCHAPELON:I totally agree with you the N&W engines would not run out of steam at all but it would affect engines permormance: Reading your post, can we conclude, a given firebox, mated with an appropriate boiler, will always deliver a certain output until its max. is reached? And only the firing rate varies? Confuses me, 'cause weren't oil-burners in general more powerful? I think about the German post-war DB01, DB45, ... classes, the difference between coal and oil was ~200hp on these 2000hp engines. Is that caused from heat content of oil, or do other things play a role? However, 200hp more or less for a 5000-6000hp class engine would a be small percentage, but 10%?Looking forward for Your answers!larsP.S:You may find the graph at http://locofonic.alphalink.com.au/te1.htm
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