Some Muni riders saw changes to their commute Monday morning with the start of Muni’s Twin Peak Tunnel closure, which is set to run most of the summer.
The century-old tunnel will have its tracks and drainage system replaced and its walls repaired, among other improvements, in order to lift a speed restriction that has slowed trains to 40 miles per hour.
The construction, which is expected to run continuously for the next two months, will shut dow the Forest Hill and West Portal stations, according to the San Francisco Municipal Transportation Agency.
The K Ingleside line will run on a shortened route, operating between West Portal Avenue/Sloat Avenue/Portola Drive and Balboa Park Station. It will then continue as the J Church line to Embarcadero. The SFMTA recommends riders heading downtown transfer to BART at Balboa Park.
On weekday mornings from 6 a.m. to 10 a.m., Muni riders transferring from M buses or K trains to BART at Balboa Park can pick up a free BART single-ride ticket that will take them downtown as far as the Embarcadero BART Station, according to the SFMTA website.
L buses will run between the San Francisco Zoo and Church station. They will not stop at 15th Avenue and Taraval, Ulloa and Forest Side, and West Portal Station. Temporary bus stops, however, have placed.
A full map of the train and bus service has been provided on the SFMTA website.
In addition to replacing the drainage system and old tracks, the construction will install seismic upgrades and improve the fire suppression system at West Portal Station.
The continuous closure will run for about two months, according to the SFMTA, but construction will not be completed until Winter 2019.
Construction is being staged on both sides of the tunnel, which has temporarily removed parking on the east and west sides of Junipero Serra, between Ocean Avenue and Sloat Boulevard. This parking, the SFMTA website said, will be removed until construction is complete. Traffic on Junipero Serra will not be affected.