Union Pacific designers created an entirely new class of articulated power in the early 1940s. The massive size and weight required eight axles per engine, while four-wheel pilot and trailing trucks were added front and rear. During construction at ALCO, an unknown worker chalked the name Big Boy on one of the new 4-8-8-4s and a legend was born. Delivered in the fall of 1941, locos #4000-4019 were soon handling an incredible volume of wartime traffic. To keep pace, five
...more about the Rivarossi Steam 4-8-8-4 ''Big Boy'' Powered -- Union Pacific #4024 (black, silver) - HO-Scale
