Work to complete the electrification of the troubled Gospel Oak to Barking line will be completed by January 2018 Network Rail has said.
The project to electrify the 22.4km line was left incomplete when it opened in February this year, as flaws in the design of the overhead line carrying structures meant they could not be installed.
At the time, Network Rail promised to publish plans to finish the line, but this was delayed after it admitted it needed more time to agree plans with Transport for London (TfL) and the Department for Transport (DfT), which are funding the scheme.
However the rail body has now said the line will be open by early next year, ready for when the current diesel services will be replaced by new double length, electric trains in the spring.
Network Rail route managing director Meliha Duymaz said: “The Gospel Oak to Barking line is set to benefit from a transformational upgrade with better services provided by a new fleet of longer electric trains, doubling the current capacity.
“This project has not been without its difficulties and we’d like to apologise for the continued disruption and thank both passengers and neighbours for their patience while we finish our work.
“We still have a lot to do but with a new team in place to finish off the project, I’m confident that the immense benefits of this once-in-a-lifetime investment will be realised in the months ahead, and the benefits enjoyed for years to come.”
Weekend closures will take place from Saturday 29 July to Sunday 10 September with additional closures later on in the year.