Engineers driving the Union Pacific Big Boy No. 4014 steam locomotive sound the whistle as the train passes beneath the historic Strawberry Mansion Bridge in Philadelphia, PA, USA on July 3, 2026. The world's largest operating steam locomotive is visiting the city for the USA250 semiquincentennial celebrations, crossing a bridge that previously served as a primary gateway to Fairmount Park during the 1876 Centennial International Exhibition 150 years ago.Engineers driving the Union Pacific Big Boy No. 4014 steam locomotive sound the whistle as the train passes beneath the historic Strawberry Mansion Bridge in Philadelphia, PA, USA on July 3, 2026. The world's largest operating steam locomotive is visiting the city for the USA250 semiquincentennial celebrations, crossing a bridge that previously served as a primary gateway to Fairmount Park during the 1876 Centennial International Exhibition 150 years ago.
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