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The SDP40F was a 6-axle diesel-electric locomotive built by General Motors Electro-Motive Division in 1973-74 for Amtrak. It had an EMD 645E3 16-cylinder turbocharged Diesel engine that generated . ==Origins== The SDP40F was the first locomotive built new for Amtrak. Until then, most of Amtrak's engines were EMD E-units and F-units that predecessor railroads had used for many years without good maintenance, resulting in breakdowns. A modern locomotive, like the SDP40F was an interim solution. Based on EMD's ubiquitous SD40-2 freight locomotive, 150 SDP40Fs were built over a period of two years. They were full-width body cowl unit locomotives, similar in appearance to the traditional cab units that many passenger locomotives at the time featured, but featuring a normal frame and superficial bodywork, rather than having a feame integrated with the bodywork, as in a cab unit. Basically, they were identical structurally to the narrow-hood SD-40 road switcher freight locomotive, but with a "passenger-style" full width cab. One difference was that as a passenger locomotive, it featured a higher 57:20 gearing that allowed . Two vapor steam generators and a water tank at the rear of the engine room made the steam needed for supplying heat (and sometimes cooling) and hot water for the train, as most of Amtrak's passenger cars were steam-heated at the time. (Another tank below the frame carried 2150 gallons more water.) They were designed for easy conversion to freight locomotives should Amtrak cease operation. EMD based the SDP40F name on the existing SDP40. Several years earlier, EMD had made similar versions of the SDP45 and SD45 in a full-width cowl unit, which it named FP45 and F45. Although the SDP40F was externally nearly identical to the FP45, EMD chose not to give the new locomotive a similar name such as FP40. EMD wanted to avoid adding a new locomotive type to their catalog due to price controls in effect in the early 1970s. The following year, the F40C name was used for a similar locomotive ordered by the Milwaukee Road, equipped with head end power instead of steam generators.〔 Eventually, the SDP40F was phased out as all-electric cars, such as Amfleet, displaced the old steam heat rolling stock. While the SDP40F was designed with conversion to HEP in mind, the bad press they received, cost to upgrade and overhaul the units, and Amtrak's satisfaction with the versatility of the head end power-equipped F40PH ultimately doomed the SDP40F. Amtrak was able to trade in SDP40Fs to EMD as more F40PH units were acquired in the late 70's. The last SDP was retired in the early 80's. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「EMD SDP40F」の詳細全文を読む スポンサード リンク
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