Two of the passengers, Sinitta and Beverley, told the BBC there was a fire after the collision.”The train stopped suddenly and then people started screaming,” they said. “Then we saw the fire so we moved up the train, and they evacuated the train.”In a statement released after the collision the British Transport Police said that the Rail Accident Investigation Branch had been notified of the incident.The Rail Accident Investigation Branch is a specialised government agency that works with the Department for Transport and independently investigates railway accidents. The victims were aged 15 and 72Credit:Eddie Mitchell The line was closed after the crashCredit:Peter Macdiarmid/LNP The line between Horsham and Pulborough was closed to allow officers from the British Transport Police and Sussex Police to investigate the crash .Paramedics also attended the scene.British Transport Police Detective Inspector Brett Walker said: “This is an extremely tragic incident and our thoughts are with the family at this difficult time.”Our officers have been working at the scene, and will continue to do so for the rest of the day, to ensure we gain as much information about how the collision happened.”People should expect some disruption to services in the area while we investigate. I would like to thank the community in Barns Green for their support and patience.” Around a hundred train passengers were taken to the nearby Sumners Ponds campsite after the collision. They were given hot drinks until rail replacement buses arrived. A 15-year-old boy and his grandfather have died after a train hit the car the were travelling in at a level crossing in West Sussex.Emergency services were called to the Barns Green level crossing at 8.47am Saturday morning and declared both the driver and the passenger dead at the scene. No one on the train was reported injured.It is believed the victims were travelling to a football match.Images of the wreckage show that the blue car was split into several parts when it was hit by the train. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.