• Monumental 1:42 Scale Replica: Experience the awe-inspiring presence of the Big Boy in perfect proportion, measuring over 70cm in length when complete - a true centerpiece that dominates any display

• Authentic 4-8-8-4 Wheel Arrangement: Faithfully recreates the unique articulated design with two sets of eight driving wheels, perfectly capturing the locomotive's distinctive profile and revolutionary engineering

• Advanced Motorized Functions: Features a powerful dual-motor system providing smooth forward and reverse movement. Includes functional LED headlight, working piston rods, and synchronized valve gear for breathtaking realism

• Unprecedented Mechanical Detail: Discover an incredibly detailed interior with visible walking beams, authentic piping, detailed cab interior with controls, and fully articulated coupling rods that move in perfect synchronization

• Premium Building Experience: Comprising 3,040 precision-engineered pieces with superior clutch power, ensuring a sturdy construction that maintains structural integrity while capturing every authentic detail of this railroad legend

Set Specifications:

• Item Number: 12049

• Theme: Historical / Railroad Engineering

• Pieces: 3,040

• Model: Union Pacific Big Boy 4-8-8-4 Steam Locomotive

• Scale: 1:42

• Functions: Motorized Drive, LED Lighting, Working Pistons

• Skill Level: Expert

The Perfect Set For:

• Railway enthusiasts and history preservationists

• Expert builders seeking the ultimate technical challenge

• Collectors of large-scale, museum-quality display models

• Adult fans of mechanical engineering and industrial history