As per reports, a section of a key London National Rail line will be closed for 16 days from 20 July to 04 August for bridge replacement, affecting London Underground, Overground and National Rail services.

• No London Overground services will run between Hackney Downs and Chingford stations. This means there will be no rail service to or from Clapton, St James Street, Walthamstow Central, Wood Street, Highams Park and Chingford stations.
• London Overground services to and from Enfield Town and Cheshunt may have different timetables during the 16 days.
• Greater Anglia services that usually run between Liverpool Street and Hertford East will start and finish at Stratford instead. The usual Stratford – Meridian Water services will not run, but other services will make additional stops at both Meridian Water and Northumberland Park. Additionally, Liverpool Street to Cambridge / Stansted Airport services will be diverted via and call at Seven Sisters instead of Tottenham Hale. Bishop’s Stortford to Stratford services will not operate, with passengers advised to use alternative services.
• Passengers wanting to travel between Liverpool Street and Hackney Downs / Bethnal Green will be able to use London Overground services running to and from Enfield Town and Cheshunt.
• Train services will also be affected by preparatory and follow-up works on 23 June, 13 and 14 July, 17 and 18 August, and 01 and 08 September.
• Further details are awaited.