GE AC44C6M

The GE AC44C6M is a 4,400-horsepower (3,300 kW) diesel locomotive that was built by GE Transportation Systems, and rebuilt by GE, American Motive Power, Inc., and Norfolk Southern's Juniata and Roanoke Shops, starting in September 2015. The AC44C6M retains the 16-cylinder 7FDL-16 prime mover used in the core locomotive prior to rebuilding, but features GE's alternating current 5GEB13B7 traction motors. Externally, the rebuilds have received new wide-nosed cabs and a new front hood section of the same design as on the ES44AC, while retaining the underframe and engine and radiator compartments of the original Dash 9 units. Internally, AC44C6M features a new under-floor air conditioner, cab signals, LSL, DPU systems, PTC, and ECP braking ability, a significant technological improvement from the GE Dash 9-40C units.

GE AC44C6M[1]
NS 4005 in Roanoke, VA.
Type and origin Power type Diesel-electric Builder GE Transportation Systems/American Motive Power, Inc/Norfolk Southern Model AC44C6M Build date August 2015-Present Total produced 275 (at least 575 Planned)
Specifications Configuration: ​  • AAR C-C Gauge 4 ft 8 1⁄2 in (1,435 mm) Trucks GE HiAd Wheel diameter 40 in (1,000 mm) Wheelbase 13 ft 7 in (4.14 m) Length 73 ft 2 in (22.30 m) Loco weight 432,000 lb (196 t), full supplies - (fuel oil, lube oil, sand). Fuel capacity 4,600 US gal (17 kL) Lubricant cap. 410 US gal (1.6 kL) Sandbox cap. 40 cu ft (1.1 m3) Prime mover GE 7FDL-16 Traction motors GE 5GEB13B7 AC
Performance figures Maximum speed 75 mph (121 km/h) Power output 4,400 hp (3,300 kW) Tractive effort 180,000 lbf (800 kN) (continuous) 200,000 lbf (890 kN) (starting) [2]
Career Locale United States Current owner Norfolk Southern, Canadian Pacific, CSX Transportation

Norfolk Southern Railway (NS) is a significant operator of this model. All 124 of their remaining Dash 9-40C units, numbered 8764–8888 (excluding 8798, which was wrecked in 2018) were rebuilt from 2015 to 2018 and numbered 4000-4124.[1] The railroad plans to also upgrade all of its Dash 9–40CW units to the same standard, except for one locomotive, which was instead rebuilt as an AC44C6CF and numbered 8520. However, due to repeated failures, 8520 was retired and sold to Knoxville Locomotive Works in August 2020.[3]