Union Pacific “Big Boy” 4014 is the largest operating steam locomotive in the world and one of the biggest ever built. The locomotive is seen here in July of 2024 on a publicity tour for the Union Pacific Railroad. Union Pacific Railroad #trains #steamtrain #bigboy #bigboy4014 #trainspotting #unionpacific | Coasterfan2105

Big Boy shows the 4-8-8-4 wheel config! 📹 credit: @renotahoeweatherman (instagram) and Patrick Fountain The Big Boy locomotives feature a distinctive 4-8-8-4 wheel arrangement: four pilot wheels, followed by two sets of eight driving wheels linked to pistons, and four trailing wheels. This combination of power and stability allowed them to handle the rugged, mountainous routes they were built for. By the late 1940s, they were working on the challenging stretch between Cheyenne and Laramie, Wyom

UP's Big Boy pulling in Cheyenne sometime in the late 1950s. From the Pentrex program "Union Pacific Big Boy Collection" which has every Big Boy to hit the rails! http://rfd.video/BigBoyCollection | Railfan Depot

Witnessing the legendary Union Pacific Big Boy 4014 up close. | Union Pacific Big Boy Heritage Shop