NTSB finds lack of maintenance caused SEPTA trolley incident

The National Transportation Safety Board is investigating a trolley incident that occurred on September 25, 2025. The Board found that the probable cause was a lack of a formal inspection and maintenance program for the overhead catenary system. This failure led to the pantograph on the trolley becoming entangled in the wires and separating, causing components to penetrate the passenger compartment of westbound SEPTA Trolley 111. The incident resulted in four people being transported to hospitals for minor injuries.

The NTSB stated that the lack of a formal maintenance program was the probable cause, while also noting that the Pennsylvania Department of Transportation State Safety Oversight Agency failed to require SEPTA to implement such a program after identifying inadequate activities. The findings highlight issues regarding infrastructure safety and regulatory oversight of transit systems.