The SEPTA trolley tunnel in Center City is about to close for more than a week for construction work.
SEPTA says the trolleys on Routes 11, 13, 34 and 36 won't operate through the Center City tunnel from 10 p.m. Friday through 5 a.m. on Aug. 12.
During that time, trolleys will be diverted to 40th and Market streets, where trolley service will start and end, the transit agency says.
Additionally, the shuttle buses that are being used in place of Route 10 trolleys due to Lancaster Avenue track renewal work will travel to and from 40th and Filbert streets instead of 33rd and Market streets.
Passengers can then transfer to the Market-Frankford subway line at the 40th Street station to travel to and from Center City.
Market-Frankford service in Center City will not be affected by the track work.
The closure is due to a number of wire, track and station construction projects.
During the shutdown, SEPTA says it plans to replace about 10,000 feet of worn overhead wire, 2,500 feet of ceiling trough and other worn track components, including track switches near 34th Street.
SEPTA says it also intends to do routine maintenance throughout the tunnel and at stations and stairways. Some construction work will also be done at Dilworth Plaza.