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[quote user="GP40-2"][quote user="oltmannd"][quote user="jrbernier"]Most sources rate the Big Boy at about 7,000 hp at 40 mph, and with an axle loading of 67,500 lbs/axle.  The TE generally is listed as about 135,000 lbs.[/quote]Roughly equivalent to a pair of GP60s![/quote] The Big Boy might have put out 5,800 HP @ 40 MPH in typical running condition. Maybe 6000 HP if in exceptional condition. That 7,000 HP figure is total BS.[/quote] Big Boy: indicated HP: <A href="mailto:6680@40">6680@40</A> Calculated DBHP: <A href="mailto:6000@40">6000@40</A> Actual DBHP: <A href="mailto:6100@40">6100@40</A> Peak DBHP: <A href="mailto:6290@41">6290@41</A> If we may calculate the indicate HP of the peak, we may get a value of ~7000ihp. They were equal to 5 F3-units at this speed. The 1943 tests are not such a good indicator of Big Boys capacity. Cheers lars
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