A fault with the signalling system between Dartford and Charlton means the line towards London Bridge is blocked.
Trains may be cancelled, delayed by up to 30 minutes or revised.
Disruption is expected until 22:30.
Southeastern customer advice:
What's happened?
There is a fault with the signalling system at Slade Green affecting the line towards London Cannon Street.
Network Rail response staff are en-route.
How does this affect my journey?
Trains are currently unable to run from Dartford / Slade Green via Woolwich to London Cannon Street. Trains can run away from London Cannon Street but there may be delays to some services.
What should I do?
You may use your ticket on London Buses between Dartford and Lewisham at no extra charge.
Alternative Routes:
For details of alternative routes that may be available to complete your journey, please refer to our Alternative routes during disruption maps which can be found here
How can I stay up to date?.
You can follow us on Twitter (X) @SE_Railway or follow the Southeastern WhatsApp channel.
Thameslink customer advice:
If you are travelling now, you may need to use an alternative route to complete your journey and allow for at least 30 minutes more time to arrive at your destination.
Ticket acceptance:
You can use your ticket at no extra cost to travel on alternative Southeastern services between Dartford and London Bridge.
Planning your journey:
Please check journey planners and station information boards before you travel, and allow extra time to reach your destination.
Live departure boards can be found here and you can check the live map here to see if your journey has been affected.
You can also use the Thameslink app to find up-to-date travel information.
Can you tell me more about the incident?
A signalling fault is preventing trains from running between Dartford and London Bridge.
Network Railâs teams are on their way to investigate. To access the track safely, trains may need to be stopped entirely, which could also delay other services.
Once on-site, they'll diagnose the fault and look for a quick fix. Some repairs may take longer if replacement parts or expert advice are needed.
Check before you travel:
You can check your journey using the National Rail Enquiries real-time Journey Planner.
Compensation:
You may be entitled to compensation if you experience a delay in completing your journey today. Please keep your train ticket and make a note of your journey, as both will be required to support any claim.