Brighton commuters are enduring massive delays tonight after a man reportedly chased a dog along the railway tracks at Haywards Heath.
Southern Railway, First Capital Connect and Gatwick Express services are all either being delayed or cancelled as a result of the incident.
National Rail Enquiries reports the problem is being made worse by a signalling problem and that journeys may be delayed by up to 45 minutes.
It adds: “Only trains travelling from Gatwick Airport towards Haywards Heath are currently being affected.”
Passengers on some of the trains affected have reacted with disbelief at the news.