A Hailsham man died when he was hit by a train at Polegate station on Saturday morning.
The man, who is 47 but has not yet been named by police, was struck by the 8.33am Ashford to Brighton service at around 9.55am as it pulled into the station. His death is not being treated as suspicious.
The lines between Lewes and Eastbourne were closed for around an hour and a half and throughout the closure, rail replacement bus services were provided.
Commuters faced long delays to other services in the area and people travelling from London saw delays of up to 90 minutes.
A spokesperson for British Transport Police said its officers were called along with detectives from Sussex Police and paramedics.
“Medics from the South East Coast Ambulance Service attended, but the man, believed to be 47 and from Hailsham, was pronounced dead at the scene,” said the spokesperson.
“The man’s family have been informed and a file will be prepared for the coroner. The incident is being treated as non-suspicious.”