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[quote user="timz"][quote user="Lars Loco"] is it safe to assume that modern engines will always deliver ~90% of the prime movers output into drawbar-force over their entire speed-range ? [/quote]If an AC6000 produced 5400 dbhp at 1 mph that would be 2,000,000 lb.[/quote] Thanx Tim for the calculations, Ok, 90% may not apply to extreme conditions (speeds down to zero), as this should result in spinning wheels, how about 10mph (cont. pull.)  to 75mph?For me, It would be interesting to know how much efficient the transmission-system over the speed range works, and how much it was improved over the last 20 years. Of course, still hoping to gain some results from real field tests...is the rail industrie really so shy[}:)]Cheers lars
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