How to Track 'Big Boy,' the World's Largest Steam Locomotive
Follow Big Boy's US tour online before it concludes.
1Significance of Big Boy
Union Pacific's Big Boy No. 4014 is the world's largest operating steam locomotive. At 133 feet long and 1.2 million pounds, it's a historic engineering marvel currently touring the US to celebrate the nation's 250th anniversary.
2Tour Route
The locomotive is traveling from its base in Wyoming to California, with scheduled stops in Ohio, Indiana, Illinois, Missouri, Kansas, Colorado, and Wyoming through July. Its yellow-highlighted route can be tracked on an online map.
3Historical Legacy
Only 8 of the original 25 Big Boys remain today, with No. 4014 being the sole operational unit. Designed in 1941 for wartime heavy hauling, these giants have become icons of railroad history.
4Technical Specifications
Featuring a 4-8-8-4 wheel arrangement, the locomotive has a hinged chassis for navigating curves. It includes 4 pilot wheels, two sets of 8 driving wheels, and 4 trailing wheels. In the mid-20th century, it regularly ran 430-mile routes between Utah and Wyoming.
5Public Interest
Thousands braved 102°F heat in Philadelphia to see the historic locomotive during July 4th celebrations. Fans expressed awe at this restored engineering marvel, with one noting 'This country was built on things like this.'
6Why It Matters
Big Boy's tour isn't just a transportation event but a celebration of industrial heritage. This project highlights both engineering achievement and national identity, preserving an important piece of railroad history.