Commuters are facing problems this morning as signal failures and a lack of train crew are causing delays at East Croydon.
Southern Rail is has cancelled services across the network due to the availability of train crews.
This is affecting trains between Milton Keynes Central and East Croydon in both directions, and between London Bridge and Beckenham Junction in both directions.
Reduced services are expected until 12pm.
A fault with the signalling system between Gatwick and East Croydon has also closed some lines. Network Rail, who own and maintain the signalling and track, are attending the reported signalling fault.
Trains are currently unable to run between the stations.
Services are expected to be delayed by up to 15 minutes or altered.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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