by Fan Railer
Allen Hazen wrote:Fan Railer--Very true. hadn't really considered the short time rating, i was thinking more in terms of a continuous rating...
GE's AC60 freight locomotive is 6,000 hp on six axles -- 1,000 hp of engine horsepower per axle -- but I think part of the secret of very high tractive effort on an AC-motored locomotive is that different axles can draw different currents (so, roughly, the one's with the best instantaneous adhesion are putting out more power than the ones going over grease spots on the rail), so the motors should have at least a short-time rating significantly above that.
The PC32acdm may not have the same traction motors as the AC60 (McDonnell's book says the P32acdm has GEB15 motors as opposed to the GEB13 on GE's domestic AC freighters), so this may be comparing apples and oranges. But if Dutch (who works for Metro-North) says the electricals of a P32acdm are massively over-designed and that they can operate at 2,800 hp with two motors cut out, I'm prepared to believe him!
(Comparison: Pennsylvania Railroad's P5a, R1 and DD-2 electric locomotives had 1,250 hp per powered axle, and could, I think, operate at a significant overload for short periods.)