Archive | Featured News

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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02 October 2013 ~ 0 Comments

Now starting: Construction of Central Subway stations, tracks and operating systems

This building in Chinatown will be demolished soon to make way for the Central Subway Chinatown Station. Last month, we started the first construction activities to build the Central Subway’s stations, tracks and operating systems. This work will extend the Muni Metro T Third Line underground to improve public transit in some of San Francisco’s […]

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30 September 2013 ~ 1 Comment

Beneath the Pagoda Palace, foundations of San Francisco’s history

Father John Takahashi and Central Subway Program Director John Funghi stand beside concrete blocks that once formed the foundation of a historic North Beach church. Earlier this month, construction crews demolishing the Pagoda Palace unearthed a long-lost piece of San Francisco history: the foundations of a church that stood on these grounds more than a […]

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01 August 2013 ~ 1 Comment

Tunneling crews assemble Big Alma, the Central Subway’s second TBM

Late in the night last month, crews installed the cutter head of tunnel boring machine (TBM) Big Alma. The massive machine’s cylindrical shield was already in place below. Big Alma has arrived. The massive tunneling machine — the identical twin of recently launched Mom Chung — is now under assembly underground. Last month, tunneling crews […]

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26 July 2013 ~ 4 Comments

TBM Mom Chung launches, beginning tunnel construction beneath SF

This video shows some of the first ground spoils excavated after our first TBM, Mom Chung, launched this week. This week tunnel boring machine (TBM) Mom Chung started digging, kicking off construction of San Francisco’s first new subway tunnel in decades.  Over the next 10 months, the 350-foot-long, 750-ton machine will excavate and construct the […]

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11 July 2013 ~ 0 Comments

Construction Details | Pagoda Palace Demolition

The Central Subway tunnel will end at this site in North Beach, now home to the old Pagoda Palace Theater. Since last summer, the SFMTA has worked closely with the North Beach community and multiple city agencies to relocate the retrieval site of the Central Subway’s tunnel boring machines (TBMs) from its original site on […]

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06 June 2013 ~ 0 Comments

Mayor Lee, public officials, community members celebrate TBM Mom Chung and upcoming start of tunneling

A tour group visits tunnel boring machine Mom Chung beneath busy 4th Street. Tunnel boring machine Mom Chung is almost assembled and just about ready for launch. This summer, the 350-foot-long, 750-ton tunnel-building behemoth will begin her journey north beneath the streets of San Francisco, constructing the city’s first new subway tunnel in decades. Last […]

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