PREORDER Athearn Genesis HO G97976 4-6-6-4, Denver and Rio Grande Western #3803 | 569.49

The name "Challenger" was given to steam locomotives with a 4-6-6-4 wheel arrangement. This means that they have four wheels in the leading pilot truck, which helps guide the locomotive into curves, two sets of six driving wheels, and finally four trailing wheels, which support the rear of the engine and its massive firebox. Each set of six driving wheels is driven by two steam cylinders. In essence, the result is two engines under one boiler. The Union Pacific Railroad sponsored development of this type to meet the need for higher speeds in main-line service. Historically, articulated locomotives had been limited to slow speeds by factors inherent in their design. The technical breakthroughs achieved with the Big Boy enabled the carrier to develop a newer, improved Challenger that met their speed expectations.

Though originally intended for freight service, many Challengers were used in passenger service.

During the World War II industrial production was overseen and regulated by the Federal War Production Board. When the UP placed their 2nd Challenger order with Alco in 1943 the WPB stepped in and had 5 of the locomotives built for the Denver and Rio Grande Western RR to help fulfill their need for additional motive power to haul wartime traffic. These 5 locomotives were built to UP's specifications.

ROAD NUMBER SPECIFIC FEATURES:
#3803
Coal burner
Dual smoke stacks
Era: 1944-1946

STEAM LOCOMOTIVE FEATURES:
Illuminated number boards and headlights
Headlight turns off in reverse
Illuminated directional back-up light in the tender
Correctly operating eccentric cranks
Adjustable top cab vent and cab windows
Pivoting front and rear engines for negotiating 18" radius curves
Current pick-up on all driver and wheels
Boiler backhead with full details and printed gauges
Synchronized chuff, whistle, bell, blow-down, air compressor, dyno and pop-off valve sounds
User-controlled whistle, short whistle, bell, squeal, coupler crash, injector, water stop and light dimmer
Individually-applied detail parts, including brass-painted bell and whistle, piping, valves, generator, steps, air pump, air tanks, reverser and coupler lift bar
Front coupler pocket can be inserted to mount operating coupler
Minimum recommended radius: 22"

New FEATURES:
Lighted firebox flicker effect with see-through firebox door
Upgraded headlight lighting with brighter LED
Improved loco-to-tender connection harness for increased durability and serviceability