This Broadway Limited HO Scale Union Pacific Big Boy 4-8-8-4 steam locomotive is based on the huge articulated mallets used by UP to move tonnage across its mainline over Sherman Hill from Ogden to Wasatch, Utah, without the need for helpers. Big Boys operated into the late 1950s and several can be seen in museums and other displays. One, No. 4014, was restored to operate in excursion service beginning in 2019. This locomotive features full Paragon3 sound and DCC for realistic sound and motor control. The Paragon3 sound system works with all Broadway Limited Rolling Thunder(TM) advanced sound systems. Other features of this steam locomotive include a heavy die cast chassis, smooth-running flywheel-equipped drive, directional lighting and magnetic knuckle couplers. This HO Scale Big Boy 4-8-8-4 locomotive can be operated on all DCC systems as well as on standard DC railroads (with limited sound functionality). This model has wheels profiled to operate on Code 83 and larger rail and curves of 18" radius or larger. The Big Boy 4-8-8-4 comes with roadnumber and era-appropriate details, coal or oil tender and other details.