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The GE Dash 9-40CW is a diesel-electric locomotive built by GE Transportation Systems of Erie, Pennsylvania, between January 1996 and September 2004. All 1,090 were built for Norfolk Southern Railway, as road numbers 8889 to 9978. Part of GE's "Dash 9" series of locomotives, the Dash 9-40CW shares its frame, HiAd trucks, 16-cylinder 7FDL engine, and 752AH-31 traction motors with the GE Dash 9-44CW. But while the more common 9-44CW offers , software in the 9-40CW's engine-governing unit restricts its power output to , although the engineer can override this restriction when desired. The Dash 9-40CW was basically an extension of the previous order for the standard cab GE Dash 9-40C, built under the same premise that a lower power rating would prolong the life of the engine and use less fuel. In 2005, GE replaced the C40-9W in its locomotive catalog with the Evolution Series model, the ES40DC. Like the Dash 9-40CWs, the Evolution Series locomotives are rated at to conserve fuel. The change in output is accomplished electronically; mechanically, the two models are essentially the same. In late 2013, NS started to upgrade their C40-9Ws into C44-9Ws by increasing the wattage from , thus increasing the horsepower rating to . The units are being upgraded as they go in for their 184-day maintenance cycle. As of 2015, all units have been upgraded to 4400 and are classified as D9-44CW. ==References== ja:GE Dash 9シリーズ 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「GE Dash 9-40CW」の詳細全文を読む スポンサード リンク
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