BART Transbay Tube Retrofit Project


San Francisco, California


Bay Area Rapid Transit

Project Dates



The Transbay Tube internal retrofit project involves the installation of a steel liner inside the tube and the installation of a new water pumping system. The BART Board of Directors awarded a $313 million contract. BART’s Transbay Retrofit project retrofit of inner steel lining of the 3.6-mile-long tube under the San Francisco Bay, structural members, concreting, upgrade of the water pumping system, ventilation, and electrical work. A customized 800’ train designed to carry workers into each night for 4 to 6.5hour shifts.