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[quote user="timz"]Apparently your literature is quoting Amtrak. No one actually claimed the AEM7 could do 7000 continuous rail horsepower-- Amtrak called it 7000 "diesel equivalent" horsepower.[/quote] I just tried to that only found the higher ratings not that continous ratings were wrong. My literature were The Contemporary Diesel Spotter's Guide, Brian Solomon's Electric Locomotives and a number of websites. Nowhere I found the continous rating only what you call the diesel-equivalent horsepower. I hear this term for the first time. The Diesel rating is the input to the generator/alternator. To get from continous horsepower to diesel-equivalent horsepower they included the efficiency of generator and traction motor, in this case about 83% 5,800 hp continous/0,83 = 7,000hp diesel-equivalent. The Contemporary Diesel Spotter's Guide had it right then. They named it 7,000 CHP. Now I understand that the supposedly meant Crank horsepower. When you do the same mathe for the E60, 6,000 CHP becomes 6,000 x 0.83 = 4,980 hp cont. I calculated the efficiency of 83% backward to get the wanted results. Literature often says 81%. I assume it was done to compare the electric directly with diesel-electrics to show its advantages. Regards, Volker
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