Works to upgrade the Barking to Gospel Oak Overground will start in June (Image: TfL)
Overground users face severe delays to and from Stratford this morning, with disruption caused by earlier signal failures.
Cancelled services between Gunnersbury and Richmond has resulted in problems between Gunnersbury and Stratford and Clapham Junction.
Transport for London (TfL) says tickets will be valid on all London Underground services via any reasonable route.
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