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What is SEPTA's Norristown High Speed Line?
Fast facts on the line, still known to some as the "trolley," that was involved in a crash in Upper Darby on Tuesday.
![A SEPTA Norristown High Speed Line train carrying passengers ran into an unoccupied train early Tuesday inside the 69th Street Transportation Center in Upper Darby, injuring 42 people](https://www.inquirer.com/resizer/v2/INYNWKCIUNGVTLVVBIUX5E7HCU.jpg?auth=13164ec719efc09846b0247973d7a06bdf27c1364aedace22c324002388e1a8f&width=760&height=507&smart=true)