Rail

San Francisco tunnel boring continues progress

Posted on January 29, 2014

The San Francisco Municipal Transportation Agency (SFMTA) announced the Central Subway’s second tunnel boring machine (TBM) will soon pass beneath existing Bay Area Rapid Transit District (BART) and Muni Metro tunnels, while passing under Market Street from SoMa into Union Square.

When the Central Subway opens, the new tunnels will allow T Third Line trains to cut travel times by more than half along this busy corridor.

The SFMTA has worked in close coordination with BART and an independent panel of top tunneling experts to plan and carry out this key phase of tunnel construction. To pass beneath Market Street and the existing transit tunnels, TBM Big Alma will turn slightly left beneath 4th Street just south of Market Street. The machine will then veer right to head north under Market Street and then Stockton Street. The new T Third Line tunnels will be about 10 feet below the existing BART tunnels.

Beginning Tuesday, Big Alma was set to be in operation 24 hours a day to build the approximately 425 feet of new tunnel beneath the Market Street tunnels. Late last year the first TBM, called Mom Chung, safely and successfully completed the same undercrossing, using the same techniques and interagency coordination. Mom Chung is now beginning to tunnel under Nob Hill, heading toward Chinatown.

Including both tunnels, tunneling contractor Barnard Impregilo Healy (BIH) has constructed more than 6,900 feet of tunnel under 4th Street and Stockton Street so far.

The crossing under BART may last up to six days, with the tunneling also possibly causing BART to run at slower speeds in the area.

View comments or post a comment on this story. (0 Comments)

More News

Report finds BART facing $9.6B hole

Key findings of the report found that nearly two-thirds of BART's railcar fleet will be at least 25 years old by fiscal year 2016-17, with the majority being 40 years old, and the agency faces cash-flow challenges for projects, with its total capital needs projected to cost more than $9.6 billion between fiscal years 2014-15 and 2023-24.

Alstom completes London train modernization program

The mid-life refurbishing program included 3.7 million items replaced on the fleet, which represents about 35,000 components per train.

TriMet adding 5 officers, 4 patrols for light rail extension

The Orange Line will also expand TriMet’s extensive network of security and operational cameras by more than 230 fixed-location cameras and about 180 cameras on the new Type 5 trains.

Escalating price may halt Minn. light rail line extension

The escalating costs for the 16-mile line from Minneapolis to Eden Prairie provoked Gov. Mark Dayton to express “serious questions about its viability and affordability,” while Metropolitan Council Chair Adam Duininck did not rule out the possibility that the project could be scuttled.

IMPulse NC LLC attains APTA Gold recognition

Company is one of only two business members within APTA to reach the Gold Level for sustainability through the dedicated efforts of its employees who make it their mission to reduce the carbon footprint of its business and operate in a manner that ensures future sustainability for the community.

See More News

Post a Comment

Post Comment

Comments (0)

More From The World's Largest Fleet Publisher

Automotive Fleet

The Car and truck fleet and leasing management magazine

Business Fleet

managing 10-50 company vehicles

Fleet Financials

Executive vehicle management

Government Fleet

managing public sector vehicles & equipment

TruckingInfo.com

THE COMMERCIAL TRUCK INDUSTRY’S MOST IN-DEPTH INFORMATION SOURCE

Work Truck Magazine

The resource for managers of class 1-7 truck Fleets

Schoolbus Fleet

Serving school transportation professionals in the U.S. and Canada

LCT Magazine

Global Resource For Limousine and Bus Transportation

Please sign in or register to .    Close