Needing an engine that could pull a 3,600-ton train over steep Western grades, Union Pacific developed perhaps the most legendary locomotive in history: the 4-8-8-4 Big Boy. Though its original name was supposed to be "Wasatch" after the Utah area in which it was needed, the name "Big Boy" caught on when engineers scrawled it playfully in chalk on the side of the smoke box during construction. Only 25 were manufactured.
Equipped for DCC & Sound, this HO scale model is a top-quality replica of #4005 — the sixth Big Boy produced and an engine currently displayed at the Forney Transportation Museum in Denver! It features premium "Rolling Thunder" audio (with engine and environment sounds), factory-installed engineer and fireman figures, synchronized puffing smoke (variable in intensity and timing), lighted number boards and marker lights, an oil tender, a realistic underframe, magnetically operated knuckle couplers, and RP25 traction wheels with added weight for smooth operation. Minimum radius of 18". Measures approximately 18" long with tender.