Archive | Featured News

05 November 2015 ~ 0 Comments

Heads up – 4th and King Track Work

Starting at 10pm tomorrow Friday November 6th work will begin at the intersection of 4th and King to install a new track configuration for the future surface portion of the T Third Line extension through South of Market.  Starting November 6, work will last for eight days, finishing on November 14.  This work will temporarily affect both pedestrians and […]

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03 September 2015 ~ 0 Comments

Labor Day Weekend Trackwork

The summer of 2015 is coming to a close with a brunch of activity! The San Francisco Municipal Transportation Agency (SFMTA) is focused on projects that will make transportation safer and more reliable. In addition, BART will be shutting down the Transbay Tube for weekend track repairs. And Billy Joel is in town for a […]

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03 August 2015 ~ 2 Comments

Upcoming work at 4th and King

Heads up! Construction work at 4th & King is slated for Labor Day Weekend, September 4 through 7. This will be a two-phase project for signal installation and track enhancement. Below is the area where work will take place. Over the Labor Day Weekend, the T Third Line rail service will still run, but Muni […]

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20 May 2015 ~ 0 Comments

Media Tours Central Subway Tunnels

San Francisco Mayor Edwin M. Lee congratulates Central Subway Project Director John Funghi on completion of Tunnel Contract 1252.  This contract consists of the 1.7 mile long twin tunnels connecting South of Market through Union Square and Chinatown.   Also included in the contract (pictured here) is the tunnel portal located on 4th Street between Harrison […]

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12 February 2015 ~ 3 Comments

Tunnel Boring Machines’ Disassembly

Our recent time-lapse video highlights the break-through and removal of the tunnel boring machines (TBMs) at the retrieval shaft and gives a closer look at how work advanced at that site. The video shows TBM Mom Chung breaking into the water-filled retrieval shaft last June. The water is drained from the shaft for the arrival […]

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04 December 2014 ~ 0 Comments

Check-Out Winter Walk SF

On Dec. 3, San Francisco Mayor Ed Lee, the Union Square Business Improvement District, the San Francisco Municipal Transportation Agency and the Central Subway officially kicked-off “Winter Walk SF” in Union Square – an open plaza for the public to enjoy. This festive, pedestrian-friendly holiday hub runs through January 1 on Stockton Street between Ellis […]

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28 January 2014 ~ 0 Comments

Second Central Subway TBM to pass under Market Street, BART this week

Tunnel boring machine Big Alma, shown here, will cross under BART and Market Street this week. This week the Central Subway’s second tunnel boring machine (TBM) will pass beneath Market Street and the existing Bay Area Rapid Transit (BART) and Muni Metro tunnels, crossing from SoMa and into Union Square. The tunnel, one of two being […]

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04 December 2013 ~ 6 Comments

Time-lapse video: The first months of tunneling with TBM Mom Chung

Using time-lapse cameras installed underground, we’ve condensed the first months of tunneling into this captivating two-minute video. In the video, Central Subway crews assemble tunnel boring machine (TBM) Mom Chung and drive the state-of-the-art tunnel builder north under 4th Street to build San Francisco’s first new subway line in decades. The video shows the TBM […]

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25 November 2013 ~ 0 Comments

TBM Big Alma Launches, Commencing Construction of Second Central Subway Tunnel

Tunnel boring machine Big Alma, shown here on the right, began tunneling under 4th Street. On the left is the entrance to the parallel tunnel being built by TBM Mom Chung. There are now two 350-foot-long, 750-ton tunnel boring machines mining under 4th Street to construct the Central Subway’s pair of parallel tunnels. Our second […]

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21 November 2013 ~ 0 Comments

First Central Subway tunnel boring machine to pass under existing BART, Muni Metro tunnels next week

In the operating cabin of TBM Mom Chung, two TBM operators monitor tunneling conditions provided from a variety of state-of-the-art instruments. Next week our first tunnel boring machine, Mom Chung, will pass beneath Market Street and the existing BART and Muni Metro tunnels, crossing from SoMa and into Union Square. The tunnel, one of two […]

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