San Fran subway bid

摘要

The San Francisco Municipal Transportation Agency (SFMTA) awarded a contract worth USD 233M to a joint venture of SA Healy and Barnard on June 28 for the Central Subway extension. Underground construction includes two single-track tunnels of 1.7 miles (2.7km), which will be excavated by two TBMs of 6.4m diameter and will include a one-pass precast segmental lining. The Central Subway extension will provide rail services to Chinatown and connect to existing commuter rail lines.