I am very sorry for the serious disruption that many of you will have faced whilst travelling with us yesterday evening. At about 18:20 we received reports of a problem at the signal control located at Wimbledon. All signalling and safety equipment in the area was affected and we were unable to run trains. The reason for this damage is still being established however initial investigations suggest that it was caused by a defective core cable that feeds power to our signalling equipment.
This meant, we are unable to run trains on two out of four available lines through Wimbledon. We immediately reduced the number of trains running through Wimbledon which had an impact across our network causing congestion and delays.
Our engineers were on site at 18:30, but were not able to rectify the fault until 21:30.
We arranged for extra staff at stations where possible to help customers with travel advice, also to help keep you moving, we quickly arranged for tickets to be accepted on Southern Railway, Govia Thameslink Railway, Great Western Railway, London Underground, London Overground and London Buses.
The congestion and knock-on delays crept away from the main line and began to affect out Reading and Windsor route as crews were on delayed trains were unable to reach their next trains in time to take them into service.
This morning, some routes will have trains running with fewer carriages as they were not able to get to the correct depot last night. We hope to have this issue rectified by this evening peak.
We appreciate how frustrating it is when your train service doesn’t run as planned; we review disruptive incidents to understand how we may improve. Once again I am very sorry for the disruption you experienced yesterday.