No trains from Dartford and Bexleyheath to London
There have been no trains from Dartford to London Victoria via Bexleyheath this morning because of emergency engineering work at Nunhead.
Southeastern has warned commuters that services are unlikely to return before 8.30am.
The 7.10am Dartford to London Blackfriars service via Sidcup was also cancelled.
Other trains via Lewisham are running as timetabled.
Southeastern said: "Urgent repairs to the railway between Lewisham and Nunhead means train services running through these stations will be cancelled. Disruption is expected until 8.30am.
"Network Rail needs to carry out urgent repairs to a section of line between Lewisham and Nunhead, closing the line until approximately 8am."
Passengers can use their tickets on London Buses between Lewisham and Denmark Hill and Thameslink services via Nunhead and London Underground between London Victoria and London Cannon Street, Southwark, London Bridge and Elephant & Castle at no extra charge to complete their journeys.
If you are delayed, the train company says you should retain your ticket in case you are entitled to compensation.