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Norfolk Southern GE Dash 9-40CW No. 8921.
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GE Dash 9-40CW Diesel-Electric Locomotive
The GE Dash 9-40CW is a 4,000-horsepower (3,000 kW) road switcher 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 4,400 horsepower (3,300 kW), software in the 9-40CW's engine-governing unit restricts its power output to 4,000 horsepower (3,000 kW), 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 ES44DC. Like the Dash 9-40CWs, Norfolk Southern's ES40DC locomotives are rated at 4,000 hp (3,000 kW) 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 3,000 to 3,281 kW (4,023 to 4,400 hp), thus increasing the horsepower rating to 4,400 hp (3,281 kW). The locomotives were upgraded as they went in for their 184-day maintenance cycle. The upgrades were completed by 2015. 

As of 2017, there are plans to rebuild some earlier locomotives to the AC44C6CF standard. The AC44C6CF is the same as the AC44C6M, but with a TMV control system and interstate electronic fuel injection. They will be renumbered in the 85xx series.

GE Dash 9-40CW Overview
Type and origin
Power type: Diesel-electric
Builder: GE Transportation Systems
Model: GE Dash 9-40CW
Build date: January 1996 – September 2004
Specifications
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Performance figures
Power output original: 4,000 hp (2,983 kW)

Power output  uprated: 4,400 hp (3,281 kW)
Career
Locale: United States
Disposition: All units upgraded to and reclassified as D9-44CW. Some will be rebuilt as AC44C6CF.

See also:

Norfolk Southern Railway

GE Transportation

GE Diesel-Electric Locomotives

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Norfolk Southern GE Dash 9-40CW No. 8921.

By terry cantrell - originally posted to Flickr as SP 8921, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=3877300