The Central Subway is the first sizable extension of the MUNI Metro network since 2007, when the T Third Street began service. The Central Subway will link the T with Chinatown and Union Square, as well as a future extension to Northbeach. The Central Subway is slated to open in 2019.
From November 6th to the 14th, SFMTA crews will be constructing a portion of the Central Subway at 4th & King Streets, located at AT&T Park and CalTrain.
During the construction, MUNI's whole entire rail storage facility will be closed off, which will affect all MUNI service throughout the City.
For starters, both streetcar lines will be impacted. The E Embarcadero, which runs only on weekends for now, will not run during the two weekend time periods between November 6th and 14th. And the F Market will begin service 45 minutes later than usual.
Many Metro lines will be affected as well. The T Third will be replaced entirely by buses (see map below). Stops will be on the curbside, rather than the center of the street.
Along with likely delays, the N Judah will stop at a temporary platform on King Street between 3rd & 4th Streets. And the K Ingleside will only run from Balboa Park to Embarcadero, and will not switch to the T. Riders continuing southbound will need to transfer to the N or the T Bus Shuttle.
Buses will, of course, be affected as well. The 81X and 82X will stop on the south side of Townsend between Lusk and 3rd Street.
Starting Saturday morning at 5 AM, bus shuttles will replace the N Judah between Ocean Beach and Church & Duboce as part of the Sunset Tunnel Trackway Improvement Project. This will last until the end of service on Monday.