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.
Industry-Leading SOUND Features:
- Operates in DC & DCC (use DCMaster for DC Sound)
- Record & Play Operation - Records and plays back sounds and movements once or repeatedly for automatic operation
- 16-bit Sample Rate for exceptional high frequency sound clarity
- Playback Whistle for multiple whistle lengths and patterns
- Choice of 3 selectable Whistles
- Alternate Whistle / Horn where applicable for locomotive with air horn and steam whistle - both the main whistle and alternate can be easily played
- Adjustable bell ringing interval for faster or slower bell
- Numerous user-mappable functions with available keys
- Johnson Bar or Power Reverse Sound at Direction Change
- Passenger Station Ambient Sounds - Controlled with Function Key
- Freight Yard related radio chatter - Controlled with Function Key
- Lumber Yard Ambient Sounds - Controlled with Function Key
- Farm related radio chatter - Controlled with Function Key
- Crew Radio Communications - Controlled with Function Key
- Maintenance Yard related radio chatter - Controlled with Function Key
- Demo Mode for display and demonstrations
- Grade Crossing Signal - Controlled with Function Key
- Simple Programming with Integral DCC Decoder
- Automatic Forward / Reverse Signal - When activated, stopping triggers and stop whistle toot. When moving forward from a stopped position, toots twice. When moving in reverse, toots three times.
- Chuff sound intensity varies with load
- Individually adjustable sound volumes for most effects
**Specifications on this page subject to change.