Southern Rail and Thameslink have been hit by a signal failure as thousands of passengers face rush hour travel chaos. A “major signal fault” at around 4am this morning resulted in disruption to networks as “no trains” were expected to run until further notice. Passengers, including commuters and holidaymakers, were warned not to travel due to the fault. Some services resumed at 7am but Gatwick Express trains continue not to run. Services between Littlehampton and London Victoria have also been cancelled. Disruption is expected to last until midday but reduced services will also hit the servic…