Athearn N 4-6-6-4 withDCC & Sound UP #3997 ATH25745 N Locomotives

Union Pacific In the spring of 1941 UP locomotive designers began working on a locomotive to team up with the new 4-8-8-4 Big Boy's then under construction at Alco. The Big Boy's were designed to pull heavy freights up the Wasatch Range in Utah to the division point at Green River WY. What was needed was a locomotive to take over at that point that could speed the freights eastward across the Wyoming Division.

Building on their experience with the original CSA 4-6-6-4 Challengers UP and Alco's designers developed a newer and better Challenger type locomotive. The result was a group of 65 4-6-6-4 Challenger built in three separate groups during World War II. Athearn N 4-6-6-4 w/DCC & Sound, UP #3997, ATH25745.

In the spring of 1941 UP locomotive designers began working on a locomotive to team up with the new 4-8-8-4 Big Boy's then under construction at Alco. The Big Boy's were designed to pull heavy freights up the Wasatch Range in Utah to the division point at Green River, WY. Building on their experience with the original CSA 4-6-6-4 Challengers UP and Alco's designers developed a newer and better Challenger type locomotive.

Era 1980's - 2000's. Era 1940's - 1959. UP painted several of their Challengers in their two-tone grey paint scheme for passenger service. They also added smoke lifters and converted many to oil burners as well.

Two-tone grey w/ yellow lettering and striping. Era: Late 1940's - Mid-1950's. 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 flywheel for smooth operation. Pivoting front and rear engines for negotiating 11 radius curves.

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.

SOUND EQUIPPED MODELS ALSO FEATURE. Tender-mounted DCC decoder with SoundTraxx Tsunami2 sound. Sound, units operate in both DC and DCC.

Full DCC functions available when operated in DCC mode. Engine, whistle, and bell sounds work in DC. All functions NMRA compatible in DCC mode.

Many functions can be altered via Configuration Value (CV) changes. CV chart included in the box. 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. We do not sell used, opened, or damaged items.

Some restrictions apply based on destination and item size. We can combine multiple items if you use the shopping cart.

ORM-D and Lithium / Li-Po Battery Restrictions. Products of this nature include quarts of fuel, glues, paints, thinners, aerosol sprays, and certain lithium batteries. The mounting of engines and accessories, running fuel through engines, cutting or pushing out the balsa sheets in kits, and other similar actions constitutes used merchandise. Standalone or Nickel or Alkaline batteries which have been opened, used and / or charged, due to an abundance of caution and care for our customers. Flammable or combustible materials or products (regardless of whether the item is open or unopened) such as: Nitro engines (if fuel has entered the engine), Nitro fuel, Unopened as well as opened, charged and / or used Lithium Ion / Polymer (LiPo) batteries and other Lithium-based batteries.

Any type of opened, charged and / or used battery including LiPo, Nickel-Metal Hydride (NiMH), Nickel-Cadmium (NiCd), other Nickel-based batteries and / or Alkaline-based batteries. Paints, thinners, certain glues or cements/pastes. Aerosols or compressed gas canisters. Rockets, kits containing rockets with or without igniters, igniters, hobby fuel (both quart or gallon).

When packing your order for return, please be sure all the original packing material and instruction papers and/or manuals are included. We will be unable to process your return if parts are missing, or if items are not packed properly to avoid damage to products and their boxes and/or packages.

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Our advances in model aircraft and vehicle stabilization, 2.4GHz control and ready-to-run convenience have made RC hobbies more exciting and more accessible than ever before. More importantly, we love RC just as much as our customers do. Any product that bears the Horizon Hobby name was developed by a team of in-house experts, many of whom have decades of experience in the hobby. But our commitment to a great experience doesn't stop at the drawing board. Every Horizon Hobby product is backed by the best customer service you will find in any industry. Horizon employs nearly 700 people and sells products in more than 100 countries around the world. Corporate headquarters, along with the main distribution facility and product service center, are located in Champaign, Illinois. Additional distribution centers are located in Ontario, California and Barsbüttel, Germany (site of Horizon Hobby GmbH). California is also home to the Losi RC car division (Ontario) and the Athearn train line in Long Beach. At Horizon Hobby, we help people have fun with hobbies. That's why, when it comes to radio control fun, we don't mess around. We're always striving to answer e-mails as quickly as possible.