Because ridership on San Francisco's Muni Metro is now more than double the system's original design capacity, a $202 million Muni Metro Turnback project is under way. The bottleneck in San Francisco's public transit system will dissipate through new tunnel construction that will allow underground switching and temporary storage of transit vehicles. Capacity is expected to increase from 20 to 30 trains per hour. This article describes tunnel design, soil stabilization and tunneling equipment, tunnel construction, and the cut-and-cover section. The Muni facility is located in an area reclaimed by land filling over the seabed since the late 1800s. Excavators have uncovered wood pilings from piers, building rubble from fires, and even wooden ships. Project completion is scheduled for September 1996.


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  • Accession Number: 00721951
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 30 1996 12:00AM