Southeastern has confirmed that the works would be completed by 9.30am today (December 27) with some disruption expected until 11.30am.
Trains through Nunhead Station may still be cancelled, delayed, or revised.
The issue comes after the engineering work between Nunhead, Shortlands, Swanley, Otford, Grove Park and Hildenborough was not finished on time.
Due to this, all lines via Bromley South, Swanley, Orpington & Sevenoaks were blocked.
All lines have since reopened.
Trains running via Sole Street, Orpington, Shortlands, Bromley South and Grove Park have been delayed, altered, or cancelled.
The first trains expected to run through on each route are:
Paddock Wood Line (Charing Cross to Ramsgate / Dover via Ashford): • 8am Dover to Charing Cross • 9.59am Charing Cross to Dover Hastings Line (Charing Cross to Hastings) • 8.21am Hastings to Charing Cross • 9.08am Charing Cross to Hastings (starts from London Bridge at 9.17am) Maidstone East Line (Charing Cross to Ashford via Maidstone East) • 9.13am Maidstone East to Charing Cross • 10.31am Charing Cross to Maidstone East Sole Street Line (Cannon St to Ramsgate / Dover via Chatham) • 7.18am Dover to Cannon Street • 9.48am Cannon Street to Ramsgate Grove Park Line (Charing Cross & Cannon Street to Orpington & Sevenoaks via Grove Park) • 10.20am Orpington to Charing Cross • 9.57am Cannon Street to Orpington Bromley South Line (Blackfriars to Orpington • 9.24am Orpington to Blackfriars • 9.54am Blackfriars to Orpington