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Prototype Spotlight: Union Pacific Big Boy — The 4‑8‑8‑4 Legend Published 2025-08-27 • 8–10 minute read In this guide: A brief history Key specs & what they mean for modelers Choosing a model (HO & N) Building a believable consist Track, curves & operation FAQ Union Pacific’s Big Boy is the steam era’s headline act—designed to move tonnage over the Wasatch grades without helpers. Built in the early 1940s, the 4‑8‑8‑4 arrangement put two sets o …