A mass casualty incident has been declared in Pennsylvania as more than 100 people experienced heat-related illnesses while attending the much-anticipated event featuring the historic Big Boy No. 4014 locomotive. With temperatures soaring to 106 degrees, crowds gathered for hours to witness the world’s largest operating steam locomotive at various stops, including Berks County and South Philly. Many train enthusiasts were treated for heat-related symptoms, with dozens hospitalized. The intense heat and delayed arrival of the train contributed to this unfortunate situation, prompting local officials to respond urgently.