The station and associated lines were originally established by the
Pittsburgh Railways in 1904 following the completion of the
Mount Washington Trolley Tunnel (now Mount Washington Transit Tunnel), with the first fare-paying passengers carried on December 4, 1904. The station is situated at a complex "X-shaped" junction connecting the Mount Washington Transit Tunnel to the northwest, the
Allentown Line (Brown) to the northeast, the Beechview Line (Red) to the southwest, and the Overbrook Line (Blue and Silver) to the southeast. Historically, platforms were provided on the Allentown, Beechview, and Overbrook branches. Since 2011, however, the Allentown line has seen only limited use, primarily during tunnel closures. The connection to the Overbrook Line was closed in 1993 for reconstruction and was not restored, as the segment between South Hills Junction and Boggs station was determined to be too narrow for modern light rail vehicles. Two broad-curved ramps to the Overbrook Line was built south of South Hills Junction. The former Overbrook Line platforms at South Hills Junction remain in place but have been unused since 1993. ==References==