The man, who was in Mortlake, south London, was being filmed on a driver's dashboard camera.
The man can be seen coming from around the corner and running under the barriers as they are being lowered.
He manages to make it across the tracks before the barriers the other side are lowered completely.
Soon after the man, who has not been identified, made it to the other side, the video shows the train speeding past on the tracks.
The incident happened on 1 June at 7am, according to the Express.
No one was hurt or injured, Newsflare confirmed. No further details were released.