Hello,
UP fed the Big Boys poor low BTU-per-ton coal, whereas oil is relatively high BTU-per-ton. So that may be a part.
NW
Regarding Ed Dickens interview with trains, at the end of the article he claims that after 4014 is restored and converted to oil, it would produce 7200 hp. Everything I have ever read has put a Big Boy's drawbar hp around 6000-6200. So:
1. Is the 7200 horsepower in the pistons?
2. If it is indeed drawbar, does oil-firing really increase horsepower that much? Even as a UP fanboy, I find that really hard to believe.
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