OFF Track Maintenance

Second SFMTA Central Subway TBM continues to progress

The San Francisco Municipal Transportation Agency (SFMTA) says the Central Subway‘s second tunnel boring machine (TBM) will soon pass beneath Powell Street Station and the existing Bay Area Rapid Transit (BART) and Muni Metro tunnels, passing under Market Street from SoMa into Union Square.

When the Central Subway opens, the new tunnels will allow T Third Line trains to travel quickly beneath 4th Street and Stockton Street, cutting transit travel times by more than half along this busy corridor.