SEPTA will be closing the Subway-Surface trolley tunnel for 16 days starting July 9th at 10 pm to perform extensive maintenance. In the meantime, as per usual, trolley cars will be diverted to serve 40th & Market Streets, which allow for a free transfer to the Market-Frankford Line. The closure of the trolley tunnel for maintenance during the summer is referred to as the Trolley Tunnel blitz.
As part of the closure, SEPTA plans to completely rebuild the platforms at 22nd Street Station, replace curved tracks by 15th and 37th Street Stations, and perform deep cleaning throughout the entire tunnel.
Since 2014, SEPTA has been closing down the Subway-Surface trolley tunnel once a year for extensive work. This work is performed during the summer in order to maintain service in the trolley tunnels, which sees on average 700 vehicle trips per day. The term “Trolley Tunnel Blitz” Refers to the tunnels themselves being worked on as sort of a blitz play. The tunnel brings routes 10, 11, 13, 34, and 36 to Center City without sitting in Center City traffic.