COMMUTERS heading up to London are warned of severe disruption this morning.
South West Trains is advising passengers not to travel towards London Waterloo after a loss of all signalling in the Earlsfield area of south west London.
Trains could be cancelled, delayed by up to 90 minutes or revised until the end of service.
A total of 81 trains have been cancelled this morning with another 110 services either delayed or set for a delay later today.
Check your train here.