![]() ![]() I did the calculations for a Big Boy,based on a 300 PSI(/2=150) normal working boiler pressure, and using the optimal speed of 35 mph (Found on Wikipedia) I figured out that it goes. The Big boy also produced 6000 draw bar horse power. ![]() Or the Union Pacific Big Boy's with 4 Cylinders each 23 3/4 inches by 32 inches. CB I wouldn't call a locomotives engines small, they just look small compared to the actual monstrosity of the engine size but Just look at Pere Marquette 1225's engines, she has 2 of them each at 26 inches by 34 Inches, much bigger than most engines that we on the forums own. ![]()
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