According to a report from Austrian national broadcaster ORF in Carinthia, the 22-year-old musician from Salzburg decided to catch a train from Bad Gastein to Spittal an der Drau.
He purchased a valid ticket, but accidentally went to the wrong train platform. Upon discovering his error, he jumped across the platform, arriving just as the doors were closing, and the train began to move out of the station.
In that instant he made a very risky decision, and chose to stand on the running-board - the step leading up into the carriage - despite the doors being closed and locked.
The train continued for several kilometres, with the man holding on for dear life at speeds of up to 80 km/h, until his presence was discovered in the Tauerntunnel. Rail officials then immediately blocked the train, resuming service 30 minutes later after the crew had caught up with him.
It wasn't reported whether the crew allowed the man to continue his journey inside the train, or whether he will face police charges for his dangerous actions.