The private Market Street Railway opened a branch - built in just six days - of its Mission Street line along Ocean Avenue to Victoria Street on December 4, 1895 to serve the new Ingleside Racetrack.
The line was extended to the Ingleside House (where Ocean Avenue now meets Junipero Serra Boulevard) shortly thereafter.
The 1906 earthquake damaged many cable car and streetcar lines; in the aftermath, the United Railroads (URR) - successor to the Market Street Railway - closed many cable cars lines and expanded the electric streetcar system.
The URR resumed service on the Ocean Avenue line on May 6, 1906; the line (route 12) was soon extended to Ocean Beach via Junipero Serra Boulevard and Sloat Boulevard.

The city-owned Twin Peaks Tunnel was opened on February 3, 1918, with the K Ingleside line running through the tunnel and terminating at St. Francis Circle.
On November 25, 1918, the city and the struggling URR signed the "Parkside Agreements", which allowed Muni streetcars to use URR trackage on Junipero Serra Boulevard, Ocean Avenue, and Taraval Street, in exchange for a cash payment and shared maintenance costs.
The K Ingleside line was extended south on Junipero Serra Boulevard and east on Ocean to Ocean and Miramar on February 21, 1919.
The city purchased the private company (renamed Market Street Railway in 1921) in 1944; route 12 service was removed from Junipero Serra Boulevard and Ocean Avenue on April 8, 1945, leaving just the K Ingleside.

The line was closed and replaced by buses from February 2001 to June 7, 2003 for the Ocean Avenue Reconstruction and Improvement Project, a major street repaving and utility replacement project.
The private Market Street Railway opened a branch - built in just six days - of its Mission Street line along Ocean Avenue to Victoria Street on December 4, 1895 to serve the new Ingleside Racetrack. The line was extended to the Ingleside House (where Ocean Avenue now meets Junipero Serra Boulevard) shortly thereafter. The 1906 earthquake damaged many cable car and streetcar lines; in the aftermath, the United Railroads (URR) - successor to the Market Street Railway - closed many cable cars lines and expanded the electric streetcar system. The URR resumed service on the Ocean Avenue line on May 6, 1906; the line (route 12) was soon extended to Ocean Beach via Junipero Serra Boulevard and Sloat Boulevard.
The city-owned Twin Peaks Tunnel was opened on February 3, 1918, with the K Ingleside line running through the tunnel and terminating at St. Francis Circle. On November 25, 1918, the city and the struggling URR signed the "Parkside Agreements", which allowed Muni streetcars to use URR trackage on Junipero Serra Boulevard, Ocean Avenue, and Taraval Street, in exchange for a cash payment and shared maintenance costs. The K Ingleside line was extended south on Junipero Serra Boulevard and east on Ocean to Ocean and Miramar on February 21, 1919. The city purchased the private company (renamed Market Street Railway in 1921) in 1944; route 12 service was removed from Junipero Serra Boulevard and Ocean Avenue on April 8, 1945, leaving just the K Ingleside.
The line was closed and replaced by buses from February 2001 to June 7, 2003 for the Ocean Avenue Reconstruction and Improvement Project, a major street repaving and utility replacement project.
Junipero Serra and Ocean station