Main Northern and Epping to Chatswood lines North Shore, Northern & Western Line

diagram of northern line prior opening of epping chatswood railway line in 2009

the traditional northern line suburban portion of main northern line opened in 1886 , electrified in 1926. when sydney harbour bridge opened, northern line connected city underground , north shore line.

in 2009 epping chatswood line opened. traditional northern line route ran hornsby north sydney via strathfield , city. when epping chatswood line opened, northern line split in two, trains north of epping operating via new link, approaching city via north shore line , rejoining traditional route before terminating @ epping. northern line colour coded red prior being merged north shore , western lines. after merging, northern line loop split on weekdays, trains upper northern line continuing richmond or emu plains.

in 2018 epping chatwood line closed , converted metro. result, traditional northern line route hornsby central via strathfield reinstated expanded train services on north shore line. coincide proposed new timetable year.