This Broadway Limited HO Scale Paragon4(TM) UP 2-8-8-0 Bullmoose Brass Hybrid steam locomotive is based on the Consolidation Mallets, known as ′Bullmoose′ on the Union Pacific to move tonnage across its mainline over Sherman Hill from Cheyenne to Laramie, Wyoming. The locomotive type was originally experimented with by the Santa Fe, but the railroad never ordered any. Great Northern and UP revised the designs and ordered several. UP crews developed the nickname for the locomotives Bullmoose because they had the ability to pull the heaviest of freight trains over the mountain grade. UP eventually rostered 70 of these Mallets, both built by its own shops or by American Locomotive Company (Alco). They first went into service in 1918 and received several upgrades over their service lives. They were eventually replaced by the 9000 series, Big Boys, and Challengers. The models come with era-appropriate applied details to represent several classes of the engines. Paragon4 Series brass-hybrid models feature sound and DCC, user-adjustable smoke rate, and integral GoPack capacitor for smooth operation during small losses of electrical contact. This model has wheels profiled to operate on Code 70 and larger rail and curves of 18′ radius, but larger curves are recommended. The UP 2-8-8-0 Bullmoose is part of the line of Broadway Limited HO Scale Paragon4 locomotives.