"Emergency Engineering Work in the Wimbledon area is causing disruption to South West Trains services into and out of London Waterloo.
"All train services between Waterloo and Wimbledon are subject to delays and short notice cancellations.....
"Engineers are on site making the necessary repairs to enable us to reopen the line however we currently have no estimate for when a normal service will resume.
"We are sorry for the disruption to your journey this morning."
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Dozens of women gathered on Westminster Bridge to form a human chain in a show of solidarity with the victims of Wednesday's terror attack.
In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.