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1.2 Million Pound Steam Giant Roars Back to Life!
20 Jun
Summary
- The 1.2-million-pound Big Boy 4014 locomotive was built in 1941.
- The locomotive was restored in 2019 for exhibition purposes.
- The Big Boy Reunion event shattered attendance records at Steamtown.

The Union Pacific Big Boy 4014, the world's largest operating steam locomotive, is captivating audiences across the nation. Built in 1941 and weighing 1.2 million pounds, this 133-foot-long marvel was restored in 2019 for exhibition purposes. A dedicated crew of 12 operates and maintains the massive machine, which recently visited Steamtown National Historic Site.
The locomotive's appearance at Steamtown for a 'Big Boy Reunion' caused attendance records to shatter, with tens of thousands flocking to see the Big Boy 4014 alongside the park's non-operational Big Boy 4012. Union Pacific donated the Big Boys around 1961-62 after diesel engines replaced steam power.
The 4014 was reacquired by Union Pacific in 2015 and restored, a feat many thought impossible. Its restoration was completed in 2019 for the 150th anniversary of the golden spike ceremony. The locomotive's journey celebrates America's 250th birthday and has drawn immense public fascination.
Operating on used motor oil, the Big Boy 4014 represents a pinnacle of 1940s locomotive technology. Its intricate operation relies on the skill of its crew, who are cross-trained for all duties. The locomotive's powerful presence and historical significance continue to resonate deeply with the public.