America 250 event: Union Pacific Big Boy No. 4014, the world's largest operating steam locomotive crosses the Susquehanna River on the Rockville Bridge above Harrisburg, PA, July 7, 2026 [Photo: Dana Dymond]
America 250 event: Union Pacific Big Boy No. 4014, the world's largest operating steam locomotive crosses the Susquehanna River on the Rockville Bridge above Harrisburg, PA, July 7, 2026 [Photo: Dana Dymond]
![America 250 event: Union Pacific Big Boy No. 4014, the world's largest operating steam locomotive crosses the Susquehanna River on the Rockville Bridge above Harrisburg, PA, July 7, 2026 [Photo: Dana Dymond]](https://files.cdn-files-a.com/uploads/10931370/2000_6a5d498402c0e.jpg)