June 17, 2014

San Francisco completes tunneling work

SFMTA

SFMTA
The San Francisco Municipal Transportation Agency (SFMTA) celebrated the completion of tunneling work for the Central Subway Project, the major extension of the Municipal Railway (Muni) Metro T Third Line.

The two 350-foot-long tunnel boring machines (TBMs) each tunneled 8,500 feet to construct two Central Subway tunnels, which will allow the T Third Line trains to travel quickly beneath SoMa, Union Square and Chinatown when the Central Subway opens in 2019, cutting travel times by more than half along the busy corridor.

The 750 ton, identical TBMs are named “Mom Chung” after Dr. Margaret “Mom” Chung, the country’s first female Chinese-American physician and a surrogate mother to thousands of veterans in World War II, and “Big Alma” after 19th century San Francisco philanthropist and socialite “Big Alma” de Bretteville Spreckels.

Mom Chung launched in June 2013 and Big Alma followed in November 2013, traveling beneath 4th Street, Stockton Street and Columbus Avenue to excavate and construct San Francisco’s first new subway tunnel in more than 30 years.

The TBMs excavated and constructed the Central Subway’s 1.5 mile-long tunnels at an average pace of 40 feet per day and will be retrieved in North Beach at the site of the former Pagoda Palace Theatre on Powell Street. Over the next few months, both Big Alma and Mom Chung will be dismantled and removed from the tunnels to be reused in tunneling efforts in other cities around the world.

deli.cio.us digg it stumble upon newsvine
[ Request More Info about this product / service / company ]


E-NEWSLETTER

Receive the latest Metro E-Newsletters in your inbox!

Join the Metro E-Newsletters and receive the latest news in your e-mail inbox once a week. SIGN UP NOW!

View the latest eNews
Express Tuesday | Express Thursday | University Transit

White Papers

Mass Transit Capital Planning An overview of the world-class best practices for assessing, prioritizing, and funding capital projects to optimize resources and align with the organization’s most critical immediate and long-term goals.

The Benefits of Door-to-Door Service in ADA Complementary Paratransit Many U.S. transit agencies continue to struggle with the quality of ADA service, the costs, and the difficulties encountered in contracting the service, which is the method of choice for a significant majority of agencies. One of the most basic policy decisions an agency must make involves whether to provide door-to-door, or only curb-to-curb service.

Mass transit mobile Wi-Fi & the public sector case study How Santa Clara Valley Transportation Authority successfully implemented Wi-Fi on its light rail and bus lines

More white papers


 
DIGITAL EDITION

The full contents of Metro Magazine on your computer! The digital edition is an exact replica of the print magazine with enhanced search, multimedia and hyperlink features. View the current issue