British Transport Police officers were called to the automatic half barrier crossing in Greenways at Newton Flotman, near Norwich, at about 8.15am today.
The air ambulance attended but the man was pronounced dead at the scene.
A spokesman from the British Transport Police said the death is currently not being treated as suspicious.
She said: 'Enquiries are ongoing to establish the man's identity and inform his family.
'A file will be prepared for the coroner.'
The train involved was the 8am Norwich to Liverpool Street Greater Anglia service.
Greater Anglia rail services between Norwich and Diss were suspended following the incident, but a spokesman said at 10.15am that the line had been reopened.
Buses had been put in place between Norwich and Diss and travellers to London were advised of alternative connections to the capital via Cambridge.
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