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The GE AC4400CW, sometimes referred as "AC44CW", is a 4,400 horsepower (3,300 kW) diesel-electric locomotive that was built by GE Transportation Systems between 1993 and 2004. It is similar to the Dash 9-44CW , but uses AC traction motors instead of DC, with a separate inverter per motor.
BNSF Railway is the launch customer for this model, ordering an initial batch of 25 units numbered 6600–6624. [7] The ES44C4 was initially only built for BNSF. The 4200s and units 7921-7999 are certified as Tier 4 Credit units, while the others are Tier 2 or Tier 3.
The railroad continued this practice until its merger with the Burlington Northern Railroad in 1995, and the new railroad, Burlington Northern-Santa Fe (later BNSF Railway) furthered the practice. Introduced during the Dash 8's later years were split-cooling in the radiators and electronic displays for the crews (instead of analogue gauges).
Union Pacific, CSX, and CPKC have rebuilt several hundred AC4400CW into AC4400CWM models. The AC44C4M is a rebuild similar to the AC44C6M, but AC44C4M locomotives feature 4 traction motors and an A1A-A1A configuration rather than the AC44C6M's 6-traction motors in a C-C configuration. This is similar to the ES44C4 and ET44C4 that BNSF also ...
The design has since proven popular with North American railroads, although some railroads, such as CSX and Canadian Pacific, preferred its AC equivalent, the AC4400CW. Because of more stringent emissions requirements that came into effect in the United States on January 1, 2005, the Dash 9-44CW has been replaced in production by the GE ES44DC.
This version of the Dash 9 was manufactured between January and March 1995. All 125 examples of this model are owned by the Norfolk Southern Railway.. The C40-9 is the only model in the Dash 9 Series to feature the standard cab design.
These traction motor replacements are part of a Norfolk Southern / General Electric project to test the economic feasibility of converting Norfolk Southern's large (125 units), but relatively old Dash 9 fleet to AC traction. (BNSF Railway is also considering a similar upgrade program for its even bigger - originally 1797 units - C44-9W fleet ...
BNSF AC4400CW 5696 pulling Metrolink in the aftermath of the derailment. Immediately following the derailment, service was suspended through the accident site, and Metrolink passengers were bussed between Camarillo, Oxnard, and East Ventura stations. [16]