A man has died after falling onto train tracks in Sydney's inner-west this afternoon.

It is believed the man fell onto the tracks by accident and it is thought he was trying to re-board a train.

When the train pulled away from the platform, it is believed the man became trapped beneath the carriage.

Emergency services attended a short time later; however the man died at the scene.

The incident happened at Dulwich Hill Station just after 4.20pm AEDT.

Police are reviewing CCTV footage to find out how it happened.

A report will be prepared for the coroner, but the incident is not being treated as suspicious.