Trains in parts of southern England have been severely disrupted after a fault in a radio system. Services out of London Waterloo, one of Britain’s busiest railway stations, have been particularly delayed. A problem with the radio network preventing communication between drivers and signallers was reported towards the end of the morning rush hour, affecting the railway’s Wessex route connecting London with the south and south-west. The fault has now been fixed but disruption is expected to continue in places until the end of the day. A number of services have been cancelled, or delayed by up to an hour and a half. Train companies advised passengers to expect some disruption, allow more time for journeys and check before travelling through the day. The most-affected operator is South Western Railway, with trains struggling to return to normal.…