Pedestrians cross the street near the Union Square construction site. During the next 10 days, construction to prepare for tunneling will continue in SoMa and Union Square. No Central Subway construction is planned in Chinatown or North Beach. For descriptions of construction impacts in each neighborhood, click here or on the links below. We also […]
Construction of the Union Square/Market Street Station, shown here, is included in the major contract awarded earlier this week. This week the SFMTA awarded the contract to construct the Central Subway’s stations, train tracks and operating systems to California-based firm Tutor Perini. Tutor Perini’s bid of $840 million was the lowest of three bids received […]
A worker prepares a concrete cylinder for installation underground. The cylinder is one component of a wall that will eventually be integrated into the Union Square/Market Street Station. During the next 10 days, construction to prepare for tunneling will continue in SoMa and Union Square. No Central Subway construction is planned in Chinatown or North […]
This time lapse video — our first ever — shows the first steps of installing and assembling tunnel boring machine Mom Chung. For the past few weeks, Central Subway crews have worked day and night to install and assemble our first tunnel boring machine, Mom Chung, underground beneath 4th Street. We’ve documented the process on […]
Crews continue to install subsurface pipes on 4th Street between Market and Stevenson. When the tunnel boring machines pass below, we will use to inject grout into the ground and improve soil conditions here. During the next 10 days, construction to prepare for tunneling will continue in SoMa and Union Square. No Central Subway construction […]
San Francisco Mayor Edwin M. Lee takes a look at tunnel boring machine Mom Chung in the excavation under 4th Street where tunneling will begin. Yesterday, Mayor Edwin M. Lee paid a visit to the construction site where tunneling will begin and saw Mom Chung, the 350-foot-long tunnel boring machine currently being assembled underground. Speaking […]
Crews are excavating a shaft on Ellis Street near where the Central Subway tunnels will pass beneath the existing BART and Muni tunnels. Crews will perform ground improvements here. During the next 10 days, construction to prepare for tunneling will continue in SoMa and Union Square. No Central Subway construction is planned to occur in […]
