Union Pacific’s Big Boy No. 4014, the world’s largest operating steam locomotive, rolled through Pennsylvania on July 7, 2026, crossing the historic Rockville Bridge over the Susquehanna River as part of the locomotive’s first-ever East Coast tour. The 1.2-million-pound, 133-foot-long machine marked a landmark moment in railroad history: this was the first time Big Boy had steamed across the Mississippi River and into the East since it was built in Schenectady, New York, and delivered to Union Pacific in December 1941.
The 2026 coast-to-coast tour celebrates America’s 250th anniversary and represents the first full transcontinental journey for the locomotive. Big Boy officially launched the tour on April 10 from downtown Sacramento near historic Milepost 0, where the Central Pacific began construction on the nation’s first transcontinental railroad in 1863. The eastern leg, which began in late May, operates in collaboration with Norfolk Southern and brings the legendary locomotive back to communities that helped power America’s industrial rise through the Ohio Valley, Pennsylvania, and the Northeast.
The Pennsylvania segment of the tour includes more than 50 whistle-stops and major display events across 10 states. Eight major public display events mark the tour’s route, including stops in Philadelphia (July 4-5), Scranton (June 15-16), and Altoona (July 9-10). The locomotive’s passage through central Pennsylvania drew thousands of spectators to trackside locations, with the Rockville Bridge crossing on July 7 becoming a focal point for rail enthusiasts and history buffs who lined viewing areas near Harrisburg.
Big Boy 4014 is one of only 25 Big Boy locomotives ever built exclusively for Union Pacific, and it remains the sole operational example of its class. Of the eight Big Boys still in existence today, No. 4014 is the only one that continues to operate. The locomotive was originally retired in 1961 after traveling over 1 million miles but was restored to operation by 2019 for Union Pacific’s 150th anniversary celebration.
The tour operates across Norfolk Southern’s network on the eastern leg, marking a historic collaboration between two of the nation’s storied railroads. Union Pacific CEO Jim Vena stated the tour “celebrates our company’s rich 164-year history, our nation’s amazing story and the people who have helped build our great country and our railroad.” The locomotive is accompanied by several historical passenger cars from Union Pacific’s Heritage Fleet, along with two commemorative locomotives: No. 1616 (the Abraham Lincoln locomotive) and No. 1776 (featuring the America250 Semiquincentennial Commission emblem).
The coast-to-coast tour concludes July 29 in Cheyenne, Wyoming, after traveling through 14 states. The Union Pacific Museum offered ticketed passenger excursion rides in vintage cars pulled by Big Boy through the Poconos Mountains in Pennsylvania on June 14, marking the only passenger excursion opportunity during the entire tour.
Sources
- Union Pacific — official schedule and press release on Big Boy’s 2026 coast-to-coast tour, including Pennsylvania stops and the first East Coast journey since 1941
- PennLive.com — reporting on Big Boy 4014 crossing the Rockville Bridge over the Susquehanna River on July 7, 2026
- trains.com — photo gallery and coverage of Big Boy in the Harrisburg, Pennsylvania area
- National Park Service — information on Big Boy Reunion at Steamtown 2026 in Scranton, Pennsylvania
