The cars of a 2 car train on the Norristown High Speed Line detached while in service and then slammed into each other (recoupling in the process). This occured between Beechwood-Brookline and Pennfield Stations at around 7:45 PM. Seven people were injured and the line was replaced with shuttle buses between 69th Street and Bryn Mawr Stations until about 10 PM.
For more information: http://articles.philly.com/2012-07-06/news/32566736_1_septa-trains-high-speed-line-bryn-mawr-station