Pre-Order | Next Shipment September 2024
Athearn - Item No. ATHG31691
3.3 out of 5 Customer Rating

HO AC4400CW Locomotive, UP/Flag #6700

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  • Large plow
  • Low mount number boards
  • Pilot mounted ditch lights
  • Early production units

UP has always been on the forefront on new locomotive technology. When GE announced an AC version of their popular DC Dash 9 locomotives, UP ordered 3 (9997-9999) in 1994 for testing. Pleased with the results, UP would come back in 1996 and order 149 units (6738-6887). Through mergers with SP and CNW, UP became one of the largest owners of AC4400’s with over 900 production units. A few received UP’s newer “flag” scheme as depicted with UP 6700 which was originally UP 9997, UP’s very first AC4400.


  • Ex: UP 9997
  • UP “Flag” repaint with yellow frame stripe
  • Nathan K3 horn
  • first UP AC4400
  • As-delivered with red frame stripe
  • Leslie 3-chime horn
  • large roof-mounted GPS dome
  • walkway capacitor box
  • As-delivered with red frame stripe
  • Leslie 3-chime horn
  • large roof-mounted GPS dome
  • walkway capacitor box


  • DCC-ready features Quick Plug™ plug-and-play technology with 21-pin NEM connector
  • Scaled from prototype resources including drawings, field measurements, photographs, and more
  • Accurately –painted and –printed paint schemes
  • LED lighting adjusted to lifelike settings.
  • Illuminated number boards
  • Illuminated ground lighting above the front truck (per prototype)
  • Illuminated front and rear walkway lights
  • Illuminated marker lights (where applicable)
  • Etched, see-through walkway steps
  • Animated roller bearing caps
  • Coupler cut levers
  • Flexible rubber MU hoses for durability
  • Flexible rubber trainline hose
  • See-through cab windows
  • Full cab interior
  • Walkway tread
  • Fine-scale Celcon handrails for scale appearance
  • Windshield wipers
  • Lift rings
  • Wire grab irons
  • Detailed fuel tank with fuel fillers, fuel gauges, & breather pipes
  • Sander lines
  • Brass horns correct to the prototype
  • McHenry® scale knuckle couplers - Kadee compatible
  • Genesis driveline with 5-pole skew wound motor, precision machined flywheels, and multi-link drivetrain
  • All-wheel drive with precision gears for smooth & quiet operation
  • All-wheel electrical pickup provides reliable current flow
  • Wheels with RP25 contours operate on all popular brands of track
  • Heavy die-cast frame for greater traction and more pulling power
  • Packaging securely holds model for safe storage


  • Onboard DCC decoder with SoundTraxx Tsunami2 sound
  • Dual cube speakers for optimal sound quality
  • Sound units operate in both DC and DCC
  • Full DCC functions available when operated in DCC mode
  • Engine, horn, and bell sounds work in DC
  • All functions NMRA compatible in DCC mode
  • Precision slow speed control
  • Program a multiple unit (MU) lashup with lead unit only horn, bell, and lights
  • Many functions can be altered via Configuration Value (CV) changes
  • CV chart included in the box


Introduced by GE in 1993 and built until 2004, when it was replaced by the Evolution Series Tier II compliant model, the AC4400CW is a staple of modern railroading. 2,834 examples were built with many still plying the rails in their as delivered configurations or as rebuilt variations. Many Class 1, regional, and foreign railroads purchased the AC4400CWs. Ownership spanned the North American Continent and with their long lives, have seen numerous paint scheme variations and ownership changes through the years. The AC4400CW went through many changes during its production. Some are easily noticeable; early units being delivered with GE’s Hi-Adhesion Trucks, while later units that had the option for newly developed GE Steerable Truck. Other details are smaller and takes a careful eye to see such as the addition of a door stop, how the step wells are reinforced, or the number and positioning of panels and doors.

Athearn has captured all these details thorough research and precision tooling to reproduce dozens of variations. The newly tooled Genesis AC4400CW takes its reign as the new flagship model for Athearn.

Product Specs

Ready/21-Pin NEM
Sub Brand
1991-2009, 2010-Present Day
Prototype Manufacturer
Reporting Mark