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[quote user="feltonhill"]   While we're tossing numbers around, my estimate for a UP FEF-3 (844) would be about 5,500 IHP at 80 mph and 86,000 lbs/hr total evaporation.  For the 4-6-6-4 (3985), it would be about 6,000 IHP at 70 mph and 94,000 lbs/hr total evaporation.  These are relatively moderate figures, not full-flog readings. <div style="clear:both;"></div> [/quote] talking about efficiency, how much power could modern "all axle roller-bearings based" steam-engines produce at the tender's draw-bar, including mechanicary and air-resistance, actually? I have never seen a "conversion table", but starting with your data, maybe ~20%? So, 4500 DBHP for  a FEF-2/3, 4800-5000 DBHP for the Chally?  Just as a rule of thumb...   -edit- Those figures in Mr. Dreyfusshudson's table talking ~10% ? Is not it awesome, from that point of view that modern diesel-electrics do not do better, regarding shaft power to drawbar.   Cheers, -lars
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