Of the 13 branches, seven were originally owned and operated by the Pennsylvania Railroad (PRR) (later Penn Central), and six by the Reading Company. The PRR lines terminated at Suburban Station; the Reading lines at Reading Terminal. The Center City Commuter Connection opened in November 1984 to unite the two systems, turning the two terminal stations (Reading Terminal having been replaced by Jefferson station) into through-stations. Most inbound trains from one line continue on as outbound trains on another line. (Some limited or express trains, and all trains on the Cynwyd Line, terminate on one of the stub-end tracks at Suburban Station.) Service on most lines operates from 5:30 a.m. to midnight.