Opportunity
In 1939, San Francisco’s Transbay Terminal was built at First and Mission Streets. The terminal served East Bay trains crossing the newly opened Bay Bridge, and provided a direct rail connection between San Francisco and the East Bay, central Contra Costa County, and the state capital of Sacramento. By the end of World War II, the terminal was serving about 26 million people per year.
In 1958, the lower level of the Bay Bridge became cars-only, and the intermodal Transbay Terminal was converted to serve only buses. The terminal was damaged by the Loma Prieta earthquake in 1989.
Ten years later, San Francisco voters approved to extend Caltrain 1.3 miles (2 kilometers) underground to a new intermodal Transbay Transit Center. The Downtown Rail Extension (DTX) would save commuters about an hour a day in travel time, and would accommodate future High-Speed Rail service from Los Angeles to San Francisco.
Solution
In 2004, Mott MacDonald was retained by the Transbay Joint Powers Authority on the program management team for the design, construction, testing, and startup of the DTX.
The DTX will combine the use of mined and cut-and-cover tunnels with open-cut construction. A new subsurface station will be built near Fourth and Townsend Streets and the existing surface station at Fourth and King will be modified.
Mott MacDonald's specific duties include the following:
- Monitoring design consultants’ progress in terms of budget and schedule
- Overseeing design development
- Reviewing design deliverables for technical content, accuracy, and constructability
- Analyzing contract procurement methods
- Developing deliverables including project cost estimate, contract packaging strategy and design criteria
Mott MacDonald also reviewed design submittals for the Transit Center building to ensure the proper coordination of structural, rail, and systems interfaces between the rail and terminal projects.
Outcome
Completed in 2018, the Transbay Transit Center, sometimes called the “Grand Central Station of the West,” is the biggest intermodal center west of New York City. It links 11 transit systems, including Amtrak, Greyhound, Muni Metro, and Bay Area Rapid Transit (BART).
With an expected completion date of 2032, the DTX is expected to reduce the number of commuter vehicles by thousands, resulting in $360 million in travel time savings, $120 million in avoided costs of vehicle operation and maintenance, and more than $20 million in safety-related benefits.