[1] The system covers a total route length of 280 miles (450 km), with 13 service lines and 155 stations.
After SEPTA was formed in 1964, the transport agency began overseeing commuter rail services, however, the railroad companies continued operating their own trains.
The tunnel allowed for trains to traveling into Center City to continue as through servicees into adjacent suburbs.
[a][7] The "R" designations were later dropped in 2010, and the network was reconfigured with 13 routes renamed for their outbound terminal stations.
Stations located within the City of Philadelphia are additionally distinguished by neighborhood or area as noted on the official SEPTA map.