What is the difference between EMD E/F units? Also, where can I find a good set of F7 sounds?
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What is the difference between
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RE: What is the difference between...
In a nutshell:F units were, primarily, freight locomotives. They have four axles and are short. They were also employed in passenger service, most notably (I think) by the Atchison, Topeka & Santa Fe Railway. A version was developed for dual passenger/freight use, dubbed 'FP' as in FP7, FP9, etc. This was different because the frame was stretched enough to include a steam generator, for use in the passenger cars. E units were, primarily, passenger locomotives. They had six axles, and were employed often in the Eastern part of the U.S., because the routes out here were more compatible with the wheel and traction motor arrangement, or something. An E-unit was by definition longer than an F-unit. Types EA through E6A had a sharply sloping nose; types E7A-E9A had the same nose as an F-unit. All E-units, so far as I know, were rigged for a steam generator in order to work with the passenger cars. The Penn Central was fond of using E-units on its Trailvan trains, for whatever reason. As for good F-unit sounds, try Marc Nelson's set at www.3dtrains.com if you've got some money in the motive power budget. His stuff's good, it's cheap, and his support is good.
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RE: What is the difference between...
The F units used 4 axles and 1350-1750 HP single prime mover (the actual diesel engine) of 16 cylinders. They could be geared for either freight or passenger service.
The E units actually used an A-1-A truck, meaning they had six wheels per truck, but only four were powered. They also had a pair of 12 cylinder prime movers of 900-1200 HP each (total 1,800-2,400 HP per unit). These were geared for high speed passenger service.
The reason the E units were dedicated passenger locomotives, is that with the A-1-A type truck, the adhesive weight is reduced and the locomotive would not be able to apply its power toward starting a heavy train. In passenger service, the starting tractive effort (pull) is not as important as the power, as the trains are light but fast. The extra power of the E units would be useful to maintain the high speeds of the trains that employed them (typically long distance mainline passenger trains).
Hope this helps,
Bob
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RE: What is the difference between...
Makes good since to me Bob.Thanks for the info.Claude Debnam NS Piedmont Division Raleigh East
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