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[quote user="ROBERT WILLISON"]Any way you cut it these were off the shelf locomotives that we're stretched to allow to make room for the steam generator and water tank. What you left out was this streching coupled with hollow booster truck's made the locomotives prone to derailment.[/quote] If you call a locomotive with a longer frame, different gearing, steam generator, divided tank, and full width hoods off the shelf l don't follow you. I didn't leave the derailments out. I didn't see a need to repeat what you already said. In addition to your derailment causes, the NTSB saw harmonic vibrations from the baggage cars as main cause. To make them better freight locomotivesATSF exchanged the hollow bolster HT-C trucks with standard HT-C trucks. [quote user="ROBERT WILLISON"]I often wonder why Amtrak didn't order F45's which were highly successful passenger units. The answer might have been it was cheaper to try to convert an existing model ( hence off the shelve ) into a passenger unit then retooling for the F 45.[/quote] Amtrak had to keep down costs and a 3,000 hp locomotive is less expensive and more reliable than a 3,600 hp locomotive especially if one doesn't need the extra 600 hp . On the other hand the FP45 was based on the predecessor series, the SD45, while the SDP40F was based on the SD40-2. I think EMD might not have offered the old electrical system anymore, just the new Dash-2 modular system. On the FP45 the electrical system would have needed a redesign, for the SDP40F the passenger train requirement were designed into the SD40-2. Just my thoughts. Regards, Volker
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