Passengers posted images on social media showing the carriages twisted and partially overturned amongst trees on the side of the tracks.
The train went off the tracks north of Melbourne.
The man also revealed that train staff had handed out complaint cards to passengers moments before the derailment, after lengthy delays were caused by ongoing problems with signals on the line.
A passenger onboard the train, Dr Scott Rickard took to Twitter to share photos of the ordeal, with claims that the train driver was injured in the incident. "Stuff flew off our tables, people started moving around, luggage went flying, that kind of thing".
According to a statement provided by V/Line, the cause for the derailment is now unknown.
The CFA said the driver appeared to be trapped.
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"All trains on the Seymour and Albury lines have been stopped and will be replaced by buses".
At least four carriages derailed and the locomotive turned on its side, Keith Pakenham of Country Fire Authority, Victoria told CNN.
One person has been airlifted to Melbourne for medical treatment.
All passengers were extracted from the train, and emergency services established a crisis centre at a nearby service station.
Police confirmed two people died in the accident.
"It's believed the train traveling from Sydney to Melbourne derailed near the Hume Freeway just before 8 p.m.", police in the state of Victoria said in a tweet.