K Ingleside

The K Ingleside is a Muni Metro line in San Francisco, California, mainly serving the West Portal and Ingleside neighborhoods. It was one of San Francisco's streetcar lines in the early 20th century, and was converted to modern light rail operation with the creation of the Muni Metro system in the late 1970s. While many streetcar lines were converted to buses after World War II, the K Ingleside remained a streetcar line due to its use of the Twin Peaks Tunnel.

The outbound end of the line was originally at the Phelan Loop (at Ocean and Lee), but it was later extended to Balboa Park Station. Eureka Station in the Twin Peaks Tunnel was originally a stop on the K line, but the station was closed and replaced by Castro Street Station when the Metro system opened.