Rail

San Francisco completes Central Subway tunnel portal entrance

Posted on May 20, 2015

Construction on the now-completed Central Subway Portal on 4th Street
Construction on the now-completed Central Subway Portal on 4th Street

The San Francisco Municipal Transportation Agency (SFMTA), which manages all transportation in the city, including the Municipal Railway (Muni), completed the Central Subway tunnel portal entrance, which was the final element to the overall tunneling contract. This portion of the Central Subway Project was completed on-time and on-budget.

The portal, at 4th and Harrison streets, was initially called the “launch box” because it served as the entrance site of two 350-foot-long boring machines (TBMs). Each TBM tunneled 8,500 feet beneath SoMa, Union Square and Chinatown creating the Central Subway tunnels. The identical twin TBMs weighed-in at 750 tons each and were affectionately named Mom Chung — for Dr. Margaret “Mom” Chung, the nation’s first Chinese-American physician — and Big Alma — for San Francisco philanthropist and socialist “Big Alma” de Bretteville Spreckles.

Now that the TBMs have completed their 1.5-mile journeys, the launch box has been seismically and structurally reinforced creating the portal where the Muni Metro T Third Line Light Rail Vehicles (LRVs) will enter and exit the Central Subway.

The tunnel portal structure contract called for a final completion date of May 15. However, the crews met expectations by substantially completing the portal structure, constructing the twin tunnels and five cross passages a month earlier.

“It was not only imperative that the portal structure create San Francisco’s next generation of public transit,” said Ed Reiskin, SFMTA Director of Transportation. “It was crucial that we adhered to our commitment to the public. We promised to deliver on-time and on-budget, and the completion of this portion of the project is another milestone that demonstrates we deliver as promised.”

The project was complete within budget estimates of $241 million. The U.S. Department of Transportation announced approval of the Full Funding Grant Agreement of $942.2 million to fund nearly half of the Central Subway Project. The remaining budget is balanced by existing state and local grant funds.

The Central Subway is expected to open to the public in 2019 and will directly serve some of San Francisco’s most densely populated communities including: the Visitacion Valley in the Southeast, east to the Bayview/Dogpatch, and west to the city’s center.

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

More News

'Overcrowding' to no longer be used as excuse for late NYC trains

As part of an overhaul of how information and train delays are collected and reported, officials will use the data to speed up slow trains.

The Boring Co. chosen to build Chicago Express Service

Plans to deliver 12-minute service from Downtown to O’Hare Airport using electric vehicles in underground tunnels.

Siemens unveils new Velaro high-speed train

Running at about 186 miles per hour, the new high-speed train uses 30% less energy than previous Velaro models, which translates to average savings of 1,375 tons of CO2 a year.

As China's rail transit systems boom, public-private partnerships face reckoning

The results have not always been positive, as cities grapple with inexperienced state-owned companies and inadequate risk management overrides prudent accounting.

Oregon's Safety Oversight Program receives FTA certification

States must receive FTA certification by April 15, 2019 or new federal transit funds cannot be awarded.

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 number 1 resource for vocational 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