Athearn ATHG04014 4-8-8-4 w/DCC & Sound, UP/Promontory #4014, HO

Save 15%
AthearnSKU: ATHG04014

In stock (5 units), ready to be shipped


New Page 1

Detailed Information


  • Excursion Version with oil tender from UP 3985 per prototype configuration
  • Reporting marks only on rear tender face per prototype 2019 configuration
  • In service appearance
  • Commemorative box
  • Chalk marking Big Boy decal included (not applied).


  • 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 its 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


  • As delivered from ALCO in service 1940s era
  • Coal Tender

Twenty-five Big Boys were built exclusively for Union Pacific Railroad, the
first of which was delivered in 1941. The locomotives were 132 feet long and
weighed 1.2 million pounds. Because of their great length, the frames of the Big
Boys were hinged, or articulated, to allow them to negotiate curves. They had
a 4-8-8-4 wheel arrangement, which meant they had four wheels on the leading set
of pilot wheels which guided the engine, eight drivers, another set of eight
drivers, and four wheels following which supported the rear of the locomotive.
The massive engines normally operated between Ogden, Utah, and Cheyenne, Wyo.

There are seven Big Boys on public display in various cities around the country.
They can be found in St. Louis, Missouri; Dallas, Texas; Omaha, Nebraska;
Denver, Colorado; Scranton, Pennsylvania; Green Bay, Wisconsin; and Cheyenne,

Source Union Pacific Railroad


  • As delivered from ALCO in service 1940s era
  • Coal Tender


  • Fully-assembled and ready-to-run
  • DCC-ready features Quick Plug plug-and-play technology with 21-pin NEM
  • 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


  • Onboard DCC decoder with SoundTraxx Tsunami2 sound
  • 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


The Union Pacifics Overland Route, the eastern portion of the Transcontinental
Railroad, was built west from Omaha, across Nebraska and Wyoming, and on into
Utah. The steepest grade was the eastbound climb on the Echo Canyon line through
the Wahsatch Mountains just east of Ogden, Utah. Forty 4-6-6-4 Challenger
locomotives were acquired in 1936 and 1937 to move fast freight over the grades
in Utah and Wyoming. They were rated at 4,290 tons across Wyoming, but were
limited to 3,100 tons eastbound through Echo Canyon.

Union Pacific wanted something that could make the same speeds as the
Challengers but could carry the entire 4,290-ton train over the Wahsatch
Mountains without a helper. The easiest solution was to scale up the successful
Challenger design by adding another pair of drivers to each half of the
locomotive thus making a 4-8-8-4.

In 1941 UP placed an order for twenty 4-8-8-4s, numbered 4000 through 4019,
with the American Locomotive Works. Each engine cost $265,174. According to
legend an unidentified machinist at the ALCO plant is responsible for the name
Big Boy, having scrawled the name in chalk on a partially completed

The Big Boys were exactly what the railroad wanted. They were coal burners with
68-inch drivers, 135,375 pounds of tractive effort and 6,000 horsepower. They
started service on the line from Ogden to Green River, Wyoming and their
operating range soon increased to cover the line all the way to Cheyenne.

Traffic during WWII resulted in five more Big Boys, numbered 4020 through 4024,
being built in 1944. These versions were slightly heavier than the original
order due to wartime materials restrictions.Despite the influx of diesel
locomotives following WWII, the Big Boys and Challengers remained the prime
power on the Overland Route. They also saw service as helpers, leading gas
turbines and diesels over Sherman Hill. They remained active through the 1950s
and werent retired until the early 1960s. By then the first twenty units had
been run well over one million miles.


LED Lighting
Union Pacific
22 inch
Minimum Age Recommendation:
14 years
Is Assembly Required:

Payment & Security

Amazon American Express Apple Pay Diners Club Discover Elo Google Pay JCB Mastercard PayPal Shop Pay Venmo Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Estimate shipping

You may also like

Recently viewed