New SEPTA system aimed at preventing train collisions

SEPTA will spend $100 million for a new, federally mandated train-control system designed to prevent the kind of collision that killed 25 people and injured more than 130 in Los Angeles in 2008. The new system must be installed by Dec. 31, 2015, under current federal law. The system will be designed to automatically halt trains if engineers do not heed stop signals.