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Oh boy. 4000 hp steam is waaaay poorer loco then 4000hp diesel (if both are rated at the same speed - say 70 mph) For starters - 4000hp steam reaches its power about 40 mph. Diesel has this power avalible at about 15 mph. This means that the diesel will have much better acceleration. Steam locos lose power when the speed goes above certain value (pistons moving too fast to effectively use all power stroke) diesels do not. On any course 4000 hp diesel will rape 4000 hp steam. Period. Actually - SD70MAC will outpull and outspeed a BigBoy - esp on a hilly route.
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