Broadway Limited Imports 9913 • Brass Hybrid UP Early Challenger (CSA-2) • Union Pacific #3835 • Post-1947 Integral Cast Cylinder Front Engine • Paragon4 Sound/DC/DCC w/ Smoke | HO Scale
Broadway Limited Imports 9913 • Brass Hybrid UP Early Challenger (CSA-2) • Union Pacific #3835 • Post-1947 Integral Cast Cylinder Front Engine • Paragon4 Sound/DC/DCC w/ Smoke | HO Scale
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Union Pacific Early Challenger CSA-2
HO Scale Paragon4 Sound/DC/DCC Steam Locomotive with Smoke
A powerful Union Pacific 4-6-6-4 Challenger with era-specific detailing, Paragon4 sound, synchronized smoke, and premium Broadway Limited performance.
Product Overview
The Union Pacific Challengers were a class of powerful, simple articulated 4-6-6-4 steam locomotives built by the American Locomotive Company for the Union Pacific Railroad. Developed for the railroad’s demanding mountain grades and high-speed freight service, these locomotives represented one of the most important steps forward in articulated steam design.
Unlike earlier articulated locomotives that were often associated with slower drag freight service, the Challengers were designed to run fast, pull hard, and cover long distances across the Union Pacific system. Their engineering success helped pave the way for the even larger Big Boy locomotives, making the Challenger an essential part of Union Pacific steam history.
This Broadway Limited Imports Early Challenger CSA-2 represents the post-1947 integral cast cylinder front engine version, giving modelers a highly detailed, era-specific locomotive with exceptional visual presence. With its long articulated frame, massive tender, and powerful 4-6-6-4 profile, this model brings the scale and drama of Union Pacific heavy steam to HO scale.
Equipped with Broadway Limited’s Paragon4 Sound & Control System, this locomotive delivers immersive operation with synchronized puffing smoke, accurate Union Pacific Challenger sounds, advanced lighting functions, dual DC/DCC operation, and smooth slow-speed performance. Whether hauling freight across mountain grades or serving as the centerpiece of a Union Pacific steam collection, this Challenger is built to impress.
Product Features
The Union Pacific Challengers were a class of powerful, simple articulated 4-6-6-4 steam locomotives built by the American Locomotive Company (ALCO) exclusively for the Union Pacific Railroad. Between 1936 and 1943, a total of 105 were constructed. Measuring an impressive 122 feet (37 m) in length and weighing 628,000 pounds (284,800 kg), these locomotives were primarily assigned to freight service across the vast Union Pacific system. However, a select few also hauled passenger trains through the rugged mountain territories of California and Oregon.
Designed specifically for Union Pacific’s demanding operating conditions, the Challengers represented a significant step forward in high-speed articulated locomotive technology. Much of the engineering experience gained from the Challenger program directly influenced the creation of the railroad’s legendary Big Boy locomotives.
The name “Challenger” refers to the 4-6-6-4 wheel arrangement: four leading wheels in the pilot truck to guide the locomotive through curves, two sets of six driving wheels powered by a total of four steam cylinders, and four trailing wheels supporting the massive firebox. In essence, each Challenger was two engines operating under one boiler. Prior to their introduction, articulated steam locomotives were generally limited to slower speeds due to design constraints. Union Pacific’s technical innovations broke that barrier, making sustained speeds over 60 mph—unheard of for articulated locomotives on other railroads—routine on their main lines.
In this production run, we are offering multiple era-specific versions: As-Delivered Front Engine, Rebuilt Front Engine, and Integral Cast Cylinder Front Engine. Alongside these historically accurate models, we are also producing three striking fantasy schemes and an unlettered, painted brass version for maximum customization.
All models are available in two configurations: Paragon4 Sound/DC/DCC with Smoke or our Stealth Series—No-Sound, DCC-Ready models with factory-installed speakers. The Stealth Series allows customers to easily install their own 21-pin DCC decoder for a simple “plug-and-play” upgrade.
Industry-leading Model Features:
Broadway Limited Imports is proud to introduce Paragon4: The new benchmark for premium HO sound-equipped locomotives. These DC and DCC-Sound equipped locomotives feature the ALL-NEW Paragon4 sound and control system. Each Paragon4 locomotive comes with BLI's own integral DCC Decoder factory installed. Paragon4 locomotives offer Dual Mode DC and DCC operation with superb back EMF motor control, improved DC motor control, built-in capacitor pack for more reliable electrical pick-up, industry best on-board sound with Rolling Thunder functionality, Pro Lighting Mode for prototypical light control, Switcher model for precise low speed control, recordable DCC operation for automated playback, and the same excellent detail level as Broadway Limited's Paragon3 Series models.
Paragon4 Sound & Control System Features:
Why We Love This Model
The Union Pacific Challenger is one of the most impressive steam locomotives ever built, and this Broadway Limited model captures the scale, power, and mechanical complexity that made the prototype so legendary. The Early Challenger design bridges the gap between classic articulated steam and the later Big Boy era, making it a fascinating centerpiece for Union Pacific modelers.
What makes this model especially exciting is the combination of era-specific detailing and Paragon4 technology. The brass boiler and tender body, diecast chassis, synchronized smoke, accurate sounds, and advanced lighting features all work together to create a premium operating experience. It looks massive, sounds powerful, and performs with the kind of smooth control that makes heavy steam especially satisfying to run.
Bring Union Pacific Heavy Steam to Your Layout
With its powerful 4-6-6-4 profile, era-specific details, synchronized smoke, premium sound, and advanced Paragon4 control system, this Union Pacific Early Challenger is a standout locomotive for collectors and operators who want true mainline steam presence in HO scale.
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