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<br /> Great explanation youngengineer, the brake release problem has surfaced several times in this thread and been beautifully covered by the people who have the best knowledge on the subject. A few days ago, I was very naive about railroad "speak", and that problem hasn't been totally eliminated but my knowledge has been greatly enhanced by some very fine efforts found on this forum. I started this thread because I was never able to fill in the reason why I no longer saw 10 unit Santa Fe consists, mostly GP's, straining up the Cajon Pass. I can now conclude that the reason for their absense can be laid at the feet of the 4000 hp locomotives. Their presense has definitely altered the look of rail traffic through the pass. I wasn't totally grasping the horsepower issue(I never worked in railroading) but the flow of explanations has narrowed the possibilities to the point where it emerges as the prime candidate. The momentum might keep this thread alive awhile longer, but I wanted to jump in here and express my thanks to all those poured serious effort into developing the information that appeared here. I have to conclude that there never was any "incident" that changed how the Santa fe was making up their consists. Thanks to everyone who took the time to add their input to this thread.
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