蒸気機関車(SL) 4-6-6-4 with Coal Tender, Union Pacific #3937 ESU LOK サウンド

日本でも人気のチャレンジャー U.P ジェネシスシリーズです。 ESU LOK SOUND搭載で高音質を誇ります。

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メーカ：アサーン
スケール：HO 1/87
電源：ＤＣＣ

Description
The Union Pacific Challengers were a type of simple articulated 4-6-6-4 steam locomotive built by American Locomotive Company for the Union Pacific Railroad. 105 of these locomotives were built between 1936 and 1943. The Challengers were nearly 122 ft (37 m) long and weighed 284,800 kg. They operated over most of the Union Pacific system, primarily in freight service, but a few were assigned to passenger trains operating through mountain territory to California and Oregon. The locomotives were built specifically for Union Pacific and much of the experience gained later went into the design of the "Big Boy".

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 Challenger enabled the carrier to develop the Big Boy with the same speed expectations. Speeds in excess of 60 M.P.H., while unheard-of on other railroads using articulated steam locomotives, became commonplace on the Union Pacific.

The 105 were divided into five orders, which can be put into two groups: the first two orders of "original" also known as "light" Challengers, and the final three of "heavy" Challengers.

Features:
Fully-assembled and ready-to-run
Boiler backhead with printed manual controls
Individually applied piping, valves, generators, etc.
Correctly operating eccentric cranks
Adjustable top cab vent
Illuminated LED directional headlight and back-up light in the tender
Five pole, skewed armature can motor with flywheels
Pivoting front and rear engines for negotiating 18" radius curves
Current pick-up on all driver and wheels
8-pin connector plug between loco and
McHenry operating knuckle couplers installled
Minimum radius: 18"
Recommended radius: 22"

SOUND EQUIPPED MODELS ALSO FEATURE:
Onboard DCC decoder with ESU LokSound
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
Excellent Slow speed control
Many functions can be altered via Configuration Value (CV) changes
CV chart included in the box