When UP design specifications were complete, it was decided on the use of a simple articulated, high speed, 132 ft. Long locomotive sporting sixteen 68 diameter drive wheels. What they created was the longest and among the heaviest, most powerful steam locomotive legends in the world.And had not the worker at ALCO chalked Big Boy on the side of the smoke box of one of the 4-8-8-4s under construction, a name that immediately caught on, it is rumored that the name of the type would have been Wasatch, for the mountains they were built to conquer. Several examples remain in museums around the country but silently they sit as a visual echo to the thunder that once made them revered throughout the landscape that the Big Boys dominated. Industry-leading Model Features: Paragon4 Sound & Control System featuring ROLLING THUNDER Integral Dual-Mode Decoder with Back EMF for Superb Slow Speed Operation in DC and DCC Precision Drive Mechanism Engineered for Heavy Towing and Smooth Slow Speed Operation Operating Smoke Unit with On/Off Switch Six Drivers and All Tender Wheels Pick-up Electricity from Track Die Cast Locomotive Body with Die Cast Chassis for Heavier Weight and Maximum Tractive Effort Rubber Tires on Two Drivers for Additional Tractive Effort Premium Caliber Painting Prototypically Accurate Paint Schemes and Road Numbers Many Separately Applied Details such as Handrails, Grab Irons, Piping, Tender Ladders, Whistle, and Bell Prototypical Headlight and Rear Light Operation Separately Controllable Cab Light and Lighted Numberboards Prototypically Accurate Sounds for the Union Pacific Big Boy Operating Microtrains-compatible Couplers Will Operate on Code 55, Code 70, and Code 80 Rail Minimum Operating Radius: 9.75 inches Paragon4 Sound & Control System Features: Operates in DC & DCC with improved DC speed control (use DCMaster for DC Sound) Built-In extra capacitance to navigate imperfect track Pro Lighting Mode offers individual control of all lights on model Switcher Mode for precise low speed control Record & Play Operation - Records and plays back sounds and movements once or repeatedly for automatic operation High Resolution Audio Quillable Horn for various whistle lengths and patterns Choice of 3 selectable Horns 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 Multiple realistic passenger and crew sounds play on command Grade Crossing Automatic Signal Automatic Forward / Reverse Signal Prime Mover sound intensity varies with load Individually adjustable sound volumes for each effect EZ Reset Button for quick return to factory default settings Specifications on this page subject to change. THANKS FOR YOUR INTEREST IN OUR ITEMS. This item is in the category "Toys & Hobbies\Model Railroads & Trains\Railroads & Trains\Locomotives". The seller is "greatdeals4uonline" and is located in this country: US. This item can be shipped to United States, Denmark, Ireland, Netherlands, Slovakia, Slovenia, Lithuania, Portugal, Malta, United Kingdom, Cyprus, Australia, Austria, Hungary, Sweden, Spain, Estonia, Belgium, Finland, Bulgaria, Poland, Luxembourg, Czech Republic, Canada, France, Germany, Latvia, Italy, Greece, Romania.