HO DDA40X, UP #6900 w/ICC Caboose #25717

Detailed Information


  • Beacon (Flash function in DCC only)
  • Classification lights (Function in DCC only)
  • Number board lights
  • Working Truck lights
  • Separate see-through walkways
  • MU hoses
  • Legendary Liveries scheme

The first DDA40X almost had a significantly different story. After success with earlier EMD double engine platforms, the call went out for the next generation of diesels. The DDA40X was the answer and the ‘X’ in DDA40X refers to the new, experimental, electrical system which became the basis of EMD’s most successful series of ‘-2’ locomotives. This improvement allowed for a long and notable career for the Centennials. As the United States approached its 200th Birthday, many railroads began painting a selection of their fleet in patriotic inspired liveries. As the story is told, Union Pacific had Chester Mack design a celebratory paint scheme for the first DDA40X to be produced. This proposed livery was brought to the decision makers and was decided against by a single vote. With permission by Union Pacific, Athearn has re-created this most legendary of Legendary Liveries.

The Bicentennial DDA40X collector’s set includes Athearn’s own interpretation of a Chester Mack inspired Bicentennial painted CA-10 caboose. Both DCC Sound equipped and DCC Ready DDA40X locomotives will come with the caboose equipped with a NCE DCC light decoder which operates on DC and DCC layouts.


  • Illuminated truck lights
  • Illuminated classification lights (where equipped)
  • Illuminated number boards
  • See-through walkways
  • 4-cube speakers
  • Minimum radius: 24” — Recommended radius: 28”

  • Coupler cut levers
  • MU hoses
  • Trainline hose
  • See-through cab windows
  • Full cab interior
  • Walkway tread
  • Windshield wipers
  • Wire grab irons
  • DCC-ready features Quick Plug™ plug-and-play technology with 21-pin NEM connector
  • Fine-scale Celcon handrails for scale appearance
  • Detailed fuel tank with fuel fillers, fuel gauges, breather pipes, and retention tanks
  • Body-mounted McHenry® operating scale knuckle couplers
  • Genesis driveline with 5-pole skew wound motor, precision machined flywheels, and multi-link drivetrain for trouble free operation
  • Eight-wheel drive with precision gears for smooth and quiet operation
  • All-wheel electrical pickup provides reliable current flow
  • Wheels with RP25 contours operate on all popular brands of track
  • LED Lighting for trouble free operation
  • Heavy die-cast frame for greater traction and more pulling power
  • Scaled from prototype resources including drawings, field measurements, photographs, and more
  • Accurately-painted and –printed paint schemes
  • Fully-assembled and ready-to-run
  • Packaging securely holds the model for safe storage


What are Legendary Liveries? An Athearn exclusive, they are the ultimate answer to “What if?” Featuring some of the most popular railroad paint schemes of all time, these models are perfect for collecting, proto-freelancing, or just plain fun! Whether company proposed paint schemes, canceled locomotive orders, or alternate takes on history, Legendary Liveries are fun and unique additions to any roster. Enjoy these items, and answer the ultimate railroad question of: “What if?”


  • Duplicated look and feel of “In Service” equipment
  • Faded base colors matched to the prototype
  • Perfect starting point for adding grime and rust


  • Onboard DCC decoder with SoundTraxx Tsunami2 sound
  • Four 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


Built by EMD exclusively for Union Pacific between 1969 & 1971, the DDA40X Centennial locomotives were the modern equivalent of the railroad’s famed Big Boy steam locomotives. These massive 98-foot double-engine diesels were UP’s mainstay hotshot power for a decade until they were sidelined by the recession of the early 1980’s. They had one last hurrah in 1984-85 when 25 of them were returned to service for about a year to help relieve a power shortage.


DCC: Ready/21-Pin NEM
SOUND: Ready
Axles: 8
Minimum Age Recommendation: 14 years
Is Assembly Required: No

HO DDA40X, UP #6900 w/ICC Caboose #25717



Due Early November, 2023

Out of Stock

View More Like This