A broken down train at Anerley is causing disruption to overground services between West Croydon and Sydenham.
Train services may be delayed or cancelled between the two situations.
The disruption is expected to last until about 8.45am.
Passengers can use their tickets on Greater Anglia, Great Northern, Southeastern, Southern, South Western Railway, TfL Rail and Thameslink services.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here