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Athearn Genesis HO 4-8-8-4 Big Boy UP Promontory, #4014 DCC/Sound
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Athearn Genesis HO 4-8-8-4 Big Boy UP Promontory, #4014 DCC/Sound

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Scale Guide


  • Great Race to Promontory version with oil tender from UP 3985 per prototype configuration
  • Reporting marks only on rear tender face per prototype 2019 configuration
  • Freshly shopped shiny appearance
  • Commemorative box
  • Chalk marking “Big Boy” factory applied to smoke box face, per prototype during summer 2019. This marking is a subtle nod to history and ALCO legend. See details on the last page of this order sheet.

Big Boy No. 4014 was delivered to Union Pacific in December 1941. The locomotive was retired in December 1961, having traveled 1,031,205 miles in its 20 years in service. Union Pacific reacquired No. 4014 from the RailGiants Museum in Pomona, California, in 2013, and relocated it back to Cheyenne to begin a multi-year restoration process. In 2019 UP #4014 was brought back to life. It had been almost 60 years and multiple generations since the last time a 4-8-8-4 Big Boy operated under it’s own power.


  • 4004: Holliday Park
  • 4005: Forney Transportation Museum
  • 4006: Museum of Transportation
  • 4012: Steamtown National Historic Site
  • 4017: National Railroad Museum
  • 4018: Museum of the American Railroad
  • 4023: Kenefick Park


  • Fully-assembled and ready-to-run
  • 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
  • Full cab interior with boiler backhead with printed gauges
  • Individually applied piping, valves, generators, etc.
  • Operating eccentric cranks on both sides operating in correct direction
  • Headlights and indicator number boxes (number boards) with directional light change
  • Five pole, skewed armature motor with dual flywheels for smooth operation
  • Pivoting front and rear engines for negotiating 22” radius curves
  • See-through running boards
  • Smoke unit ready with no soldering required
  • See through cab windows
  • McHenry scale knuckle couplers - Kadee compatible
  • Genesis driveline with 5-pole skew wound motor, precision machined flywheels, and multi-link drivetrain
  • Wheels with RP25 contours operate on all popular brands of track
  • LED Lighting for realistic appearance
  • Heavy die-cast frame for greater traction and more pulling power
  • Packaging securely holds for the model for safe storage


  • Authentic recordings from UP #4014 under steam recorded by Soundtraxx summer 2019
  • Onboard DCC decoder with SoundTraxx Tsunami2 sound
  • Decoder controlled smoke
  • Flickering firebox LED with effect
  • Sound units operate in both DC and DCC
  • Chuff, whistle, and bell sounds work in DC
  • All functions NMRA compatible in DCC mode
  • Precision slow speed control
  • Many functions can be altered via Configuration Value (CV) changes
  • CV chart included in the box
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