A government investment of £115 million will be made to electrify the Gospel Oak to Barking rail line.
The decision comes after many years of the London Assembly’s transport committee pushing for funding.
Valerie Shawcross AM, chair of the transport committee, said: "Commuters on the Barking to Gospel Oak line have waited for many years for today’s announcement confirming electrification of their rail line.
"The Assembly welcomes this decision, which will benefit the journeys of thousands of passengers who have long endured an inferior service to those using other parts of the London Overground network.
"This decision will also bring the additional benefits of reducing the line’s environmental impact and improving connectivity with the rest of London’s rail."
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