Steam

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> Figure three SD45s can haul a 7500 ton train at 51 mph, then. How fast could three 4300 hp SD70s haul it? This is not quite 20% more power than the SD45s. It takes 50% more to haul it 62 mph. So only 20% more would fall far short of 60 mph. 




You're forgetting that SD70s have a higher TE curve... thanks to radial trucks (bolsterless HTCR II vs Flexicoil) and more sophisticated traction motors (D90TR vs D77) and alternator (AR20/CA7 vs AR10/A7)

Robb Fisher
RFDI