The Barking to Gospel Oak Overground line will be closed for eight weekends as electrification work continues.
It had originally closed for eight months, reopening in February, but work was not finished on time due to design problems and the late delivery of some materials.
The line will be shut every Sunday from June 4 until July 23, with additional Saturday closures on July 9, 16 and 23.
Further temporary closures will be needed in the future to complete the work.
Richard Schofield, Network Rail’s route managing director for Anglia, said: “We will continue the electrification work during weekends in June and July while we finalise our full schedule.
“I’d like to say thank you again to passengers and lineside neighbours for their continued patience and understanding and apologise for the delay in finishing this work.”
Rail replacement buses will be running instead.
The line goes through Crouch Hill and Upper Holloway in Islington.
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