Major disruption in and out of London Waterloo expected all morning

 
Caitlin Morrison
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A signal problem is causing disruption at London Waterloo (Source: Getty)

National Rail has warned of major disruption at London Waterloo this morning, after an earlier signal failure between Putney and Barnes.

The rail operator said the problem has been fixed, but trains running between London Waterloo and Barnes may still be cancelled, delayed or revised as the service recovers. The disruption is set to continue until 12pm.

"After an earlier signal failure between Barnes and Putney all lines have re-opened and South Western Railway are currently working hard to introduce a train plan as soon as possible," said National Rail.

"We strongly advise you to check your individual journey before you travel whilst we recover the train service as some stations will still not have a train service. We advise that you do not travel unless necessary on the Hounslow loop as services will be sparse, your tickets will be accepted on London Underground and local TFL bus services."

What was the problem?
In railway signalling, an interlocking is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or crossings. The signalling appliances and tracks are sometimes collectively referred to as an interlocking plant. An interlocking is designed so that it is impossible to display a signal to proceed unless the route to be used is proven safe. A fault with this system means we are unable to communicate to train drivers that a section of track is safe to proceed onto.