FINAL UPDATE: Delay on San Bruno btwn Harkness and Wilde has cleared. IB/OB 8/8AX and 9/9R resuming regular service. (More: 10 in last 48 hours)

Central Subway Tunnel Boring Machine Time Lapse

Wednesday, December 24, 2014

Tunnel boring machines Big Alma and Mom Chung hole-through and extraction at the North Beach retrieval shaft.