T Third Bus Substitution, UCSF Mission Bay Platform Project

The SFMTA is replacing the existing UCSF Mission Bay platforms along 3rd Street between South and 16th streets. To accommodate construction work on the platform and train tracks, the T Third will be bus substituted Tuesday January 22 through March. This is in anticipation of the new Golden State Warriors’ Chase Center and the growth in jobs, housing, healthcare and retail in Mission Bay.

Construction elements included in the project:

• Remove the two existing platforms at 3rd and South streets

• Build a new center island platform

• Widen the track to accommodate the new island platform

• Install new overhead wires that power trains

• Update utility lines and street lights to support the new center island platform

• Upgrade the traffic signals at 3rd and South streets as well as 3rd Street and Campus lane

T Third Bus Substitution

T Third line will be served by buses from The Embarcadero to the terminal at Bayshore Blvd. and Sunnydale Ave. Tuesday, January 22 through March (see schedule below). Buses will serve all Muni train stations on the curbside along 3rd Street. Look for signs indicating where to board.

During these bus substitutions, those traveling underground on Muni Metro towards Bayshore Blvd. and Sunnydale Ave. will transfer to a T Third bus at The Embarcadero. Please watch for signs that will direct you to T Third bus.

Other Muni service changes:

• Cancelation of 83X January 22 through March

• Cancelation of E Embarcadero January 22 through March

This new, larger center platform will service inbound and outbound trains and greatly expand transit capacity in preparation for neighborhood growth and the new Chase Center. The two existing platforms will be demolished as part of the project. The new and improved platform’s greater size will enable four, two-car trains to load simultaneously during larger events. When needed, the platform will also allow for trains to depart inbound from both sides of the platform to connect customers quickly to BART, CalTrain and eventually the Central Subway.

For more information and to sign up for alerts, visit our webpage or follow us on Twitter @sfmta_muni. 

Note the UCSF Mission Bay Platform will be closed through late April 2019 continuing after the T Third bus substitution ends. Please use Mission Rock and Mariposa stations as an alternative while the T Third train is in service.