How the 132-Foot Big Boy Steam Locomotive Gets Around a Curve

My guide, Big Machines Explained: https://frank-guide.vercel.app The Big Boy was 132 feet long with its tender, yet it rounded curves all day. I’ll show you where its front engine pivots beneath a boiler that stays rigid—and why I was too loose when I said the locomotive “bends in the middle.” With a pencil and a picture, I’ll walk through what 4-8-8-4 counts, follow the steam from the fire to the rail, and explain why a railroad built a locomotive this long on purpose. Chapters: 0:00 The Big Boy's Hidden Hinge 1:00 Four Things Crews Knew 2:01 Frank's Point of View 2:38 Built for the Wasatch 3:42 My guide 4:01 The Lesson at the Pivot 5:20 From Fire to Steam 6:09 From Steam to Driving Wheels 6:59 Exhaust, Grip and Taking a Curve 8:12 The Big Boys Then and Now 9:52 Five Big Boy Exercises #BigBoy #SteamLocomotive #RailroadHistory #UnionPacific