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The orders for these units were basically an extension of NS's previous order for the standard cab Dash 9-40C (or C40-9) (see above). They were built under the same premise that a lower power rating than the 4,400 hp (3,300 kW) rating of the Dash 9-44CW (or C44-9W) (see below) would prolong the life of the engine, and use less fuel.
NS discontinued the rebuild program in April 2016 due to repeated failures, and even retired these locomotives in April 2020. The GE C40-8WM was an experimental rebuild program done by GE in partnership with CSX at GE's Locomotive plant at Erie, PA in late 2016 and early 2017 to see if they were worth rebuilding.
In mid 2015, NS started to upgrade its C40-9s into 4400 hp. C44-9s by upgrading the wattage to 3,281 kW, up from the as-delivered 3,000 kW. The units are being upgraded as they go in for their 184-day maintenance cycle. Also in 2015, NS 8799 became the first NS GE Dash 9-40C to be rebuilt as an AC44C6M.
The GE Dash 9-40CW is a 4,000-horsepower (3,000 kW) diesel-electric locomotive built by GE Transportation Systems of Erie, Pennsylvania, between January 1996 and December 2004. 1,090 were built for Norfolk Southern Railway, as road numbers 8889 to 9978. 53 GE Dash 8-44CWs built to Dash 9 specifications were also built for CSX Transportation, carrying road numbers 9000 to 9052.
To NS, later sold to CSXT General Electric: 1 8002 New York, Susquehanna and Western Railway: 24 4002-4048 (even nos.) To CSX St. Louis Southwestern Railway: 55 8040-8094 To Union Pacific United States Department of Energy (Savannah River Site) 1 107 Sold surplus in 2022. Now ATOM Rail 107
NS Nuclear sclerosis: NTG Normal tension glaucoma: PDR Proliferative diabetic retinopathy PDT Photodynamic therapy: PK Penetrating keratoplasy: POAG Primary open-angle glaucoma PPDR Preproliferative diabetic retinopathy PRA Pan-retinal ablation PRK Photorefractive keratectomy PRP Pan-retinal photocoagulation PSCC Posterior sub-capsular cataract PVD