A broken down train between London Victoria and Bromley South means that some lines are currently blocked.
As a result, trains to and from these stations may be cancelled, delayed or revised.
This is expected until 19:00.
What's happened?
The 15:34 service from Bedford to Brighton has come to a stop just outside Herne Hill station.
Response staff from Network Rail are on their way to the area.
How does this affect my journey?
Due to the position of the train, both lines towards Bromley South are blocked.
Trains which normally run from London Victoria to Orpington will be diverted via Catford, calling at all stations.
The line from Orpington towards London Victoria via Herne Hill is open but trains may be delayed through the area.
What do I need to do?
You can use local London Buses via reasonable routes at no extra cost to help complete your journey.
Please allow more time to reach your destination today and check online journey planners for up to date information.
Check before you travel:
You can check your journey using the National Rail Enquiries real-time Journey Planner
Twitter:
If you would like to follow this incident on Twitter, please use #HerneHill
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.