[2] Several stations with small side platforms were located along 19th Avenue, including one at Holloway Avenue; it became more important after the adjacent Parkmerced development was established in the 1940s and the San Francisco State College (later San Francisco State University) campus opened in 1953.

[1] In the early 1970s, Muni began planning an extension of the J Church line over new track to Balboa Park station, then over the M Ocean View line to the high-ridership San Francisco State University and Stonestown Galleria stations.

A Final Environmental Impact Statement for the new track was released in 1983; it was opened for non-revenue moves in August 1991 and began revenue service in June 1993.

[6][2] Original plans called for the two existing stations to be rebuilt with high-level island platforms, and a pocket track to allow J Church trains to turn back.

[2] The second phase required full bustitution beginning on July 30, 1994; rail service was restored to Stonestown on November 19 for holiday shopping, and on the rest of the line on January 28, 1995.