Union Pacific steam locomotive 4014, “Big Boy,” pulls out of Prescott, Arkansas on a cold fall morning with its excursion train as it heads north on the UP Little Rock Subdivision on November 13, 2019. | Jim Pearson Photography

🚂 Union Pacific “Big Boy” No. 4014 — the world’s largest operating steam locomotive, a 4-8-8-4 giant built by ALCO in 1941. Restored by Union Pacific in 2019, this legend still thunders on mainlines, showcasing raw steam power, massive running gear, and timeless American railroading heritage. #BigBoy4014 #UnionPacific #SteamLegend #Railfan #SteamPower #HistoricLocomotive #RailwayHeritage | Satya Singh79

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

St. Louis! Big Boy #UP4014 is steaming your way! Check out the world's largest operating steam locomotive on Sunday from 9 a.m. to 3 p.m. at Poplar & South 16th St. in St. Louis! Admission is FREE! | Union Pacific Railroad

A look at Big Boy locomotives #'s 4011, 4012 & 4013. From the Pentrex show "Union Pacific's Big Boy Collection" https://rfd.video/BBCollection | Steam Giants

Worlds largest steam locomotive!! Big Boy 4014 Union Pacific RR | Chopperguy