Officers from the British Transport Police and Sussex Police were called to the station at 6.37pm to reports a person had been hit by a train.
The man was pronounced dead at the scene and the incident is not being treated as suspicious.
A spokeswoman from the British Transport Police (BTP) said: "BTP officers were called to Moulsecoomb Station on Wednesday February 26 after a report that a man had been struck by a train.
“Officers from BTP and Sussex Police attended the incident, which was reported to BTP at 6.37pm and is currently being treated as non-suspicious.
“Medics from the South East Coast Ambulance Service also attended but the man was pronounced dead at the scene.
“The man’s family has been informed and a file will be prepared for the Coroner."
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