K Ingleside  The K Ingleside is a Muni Metro line in San Francisco, California, mainly serving the West Portal and Ingleside neighborhoods. Opened on February 3, 1918, it was the first line to use the Twin Peaks Tunnel. Following service changes on June 30, 2007, the K Ingleside and the T Third Street lines were spliced together in the Market Street subway and Twin Peaks tunnels, resulting in a combined route from the Visitacion Valley neighborhood, through downtown, to Balboa Park. At Embarcadero station, outbound T trains heading through downtown to the Ingleside neighborhood change their signs to the K line; at West Portal station, K trains heading through downtown and inbound to Third Street change signs to the T line. Each train displays its ultimate destination. This system will continue in place until the Central Subway opens, a future route for T Third Street line to Chinatown. Leaving the Twin Peaks Tunnel at the West Portal station, the K Ingleside line follows West Portal Avenue to Saint Francis Circle, where it then runs on its own right-of-way in the middle of Junipero Serra Boulevard to Ocean Avenue. The K then follows Ocean Avenue until it reaches Balboa Park Station, where it circles around the Metro yard at San Jose and Geneva Avenue, with the actual terminal stop alongside the station. The K Ingleside line stops at large stations for the downtown section of the line and at smaller stops on the rest of the line. Most of the smaller stops are nothing more than concrete "islands" in the middle of the street next to the tracks. Some of these "island" stops provide access for wheelchairs. Muni bus routes provide service to all stations and other systems with access to the stations are noted. The K Ingleside begins service at 5 a.m. weekdays, 6 a.m. Saturdays and 8 a.m. Sundays, with the end of service occurring around 12:30 a.m. each night. It operates a headway of 9 to 10 minutes during the day, and 12 to 15 minutes at night. Service is provided by overnight Owl buses during the hours that rail service is not running. The serves the portion between West Portal and Embarcadero, and the serves the portion between Balboa Park and West Portal. The K Owl bus runs a limited number of trips during late nights and early mornings. On weekends, KT Ingleside/Third Street Bus service runs from 5am until the start of rail service.