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| GE AC6000CW | |
|---|---|
| Name | GE AC6000CW |
| Powertype | Diesel-electric |
| Builder | General Electric |
| Buildmodel | AC6000CW |
| Aarwheels | C-C |
| Poweroutput | 6000 hp |
GE AC6000CW
The GE AC6000CW is a high-horsepower diesel-electric road locomotive developed by General Electric in the late 20th century for heavy freight service on North American railroads. Conceived during an era of competition with Electro-Motive Diesel and in response to orders from Union Pacific Railroad, Canadian National Railway, and other Class I carriers, the design sought to provide unprecedented power and tractive effort for heavy coal, grain, and intermodal consists. The model became notable for its 6,000 horsepower rating, its AC traction system, and the controversies surrounding its initial powerplant and reliability that influenced subsequent locomotive development and rebuild programs.
GE initiated the AC6000CW program amid demand from Union Pacific Railroad and Santa Fe Railway for higher-horsepower units to haul heavier trains across mountain divisions like the Wasatch Range and Sierra Nevada. The design built on GE’s earlier AC traction technology demonstrated in the GE AC4400CW and GE C36-7 families and incorporated lessons from collaborations with Alstom and ABB on power electronics. Key industrial partners included Caterpillar Inc. through technical comparisons, and engine suppliers such as Kawasaki Heavy Industries and DEUTZ AG influenced turbocharger and component choices. The locomotive’s carbody and underframe reflected input from railroad procurement teams at Southern Pacific Transportation Company, Conrail, and Canadian Pacific Railway, aiming to meet crashworthiness criteria similar to standards advanced by the Federal Railroad Administration and Transport Canada.
The AC6000CW used a six-axle C-C arrangement with AC traction motors derived from GE’s Series developed alongside Hitachi and Siemens. Initial units were equipped with the 7HDL or FDL-assemblies developed in cooperation with Kawasaki Heavy Industries to produce approximately 6,000 horsepower, coupled to GE’s high-voltage inverters and microprocessor controls inspired by technology from GE Transportation Systems and Westinghouse Electric Corporation research. The design emphasized high tractive effort for low-speed tonnage, employing adhesion control systems tested at facilities like the Transportation Technology Center, Pueblo. Cooling systems, dynamic braking, and electronics drew on components previously used in GE Dash 9 and Genesis series programs. Brake rigging and truck design referenced standards developed with input from Association of American Railroads committees and Union Pacific test departments.
Early AC6000CW deliveries entered service on Union Pacific Railroad mainlines, Canadian National Railway freight corridors, and select BNSF Railway divisions, operating over routes including the Overland Route and Canadian Mainline. Operational deployment saw units hauling heavy coal trains out of Powder River Basin and intermodal trains across the Transcon. Railroads reported mixed fleet availability, prompting technical reviews by GE engineers and maintenance crews from Norfolk Southern Railway and CSX Transportation that led to modifications in maintenance schedules and parts support handled through GE’s shops and third-party overhaul providers like Progress Rail Services Corporation.
Several AC6000CW units underwent conversion programs and rebuilds overseen by firms such as NREC (National Railway Equipment Company) and Mentor Railway Services, often re-engining units with lower-emission or more reliable prime movers drawn from EMD or modern GE FDL derivatives. Notable derivative programs paralleled rebuild efforts seen in the GE AC4400CW to AC44C6M conversions and the UP-led AC traction upgrade initiatives. Some units were repowered to meet regulatory regimes influenced by Environmental Protection Agency standards and provincial regulations enforced by Transport Canada.
The AC6000CW’s early operational life included issues with engine block failures and turbocharger reliability that prompted investigations and service bulletins issued jointly by GE and operators such as Union Pacific and Canadian National. High-profile incidents involving mechanical failure triggered inspections coordinated with the Federal Railroad Administration and railroad safety departments from BNSF Railway and CSX Transportation, leading to temporary derates and retrofit campaigns. Despite setbacks, units delivered substantial tonnage on mountain grades and were credited with reducing lash-up sizes on heavy manifests, a benefit noted in operational reports compiled by Association of American Railroads analysts and railway research presented at conferences by Railway Age and Trains (magazine) editors.
As fleets aged, many AC6000CW locomotives were retired, sold for parts, or repowered under programs managed by entities like Progress Rail and Genesee & Wyoming regional shops; a subset found new roles with leasing companies such as GATX Corporation and Wheeler (leasing arms) or were preserved by museums and historical societies including the California State Railroad Museum and regional railway heritage groups in Illinois and Oregon. Disposition pathways included recycling at facilities coordinated with environmental regulators in United States states and Canadian provinces, and a few units were retained in static display to illustrate late-20th-century high-horsepower diesel technology.
Category:Diesel-electric locomotives Category:General Electric locomotives