The train, carrying 153 passengers, should have slowed down at a signal about 2 kilometres away from the loop.
The tracks were significantly damaged and the busy rail line was closed.
However, well-placed sources in the rail industry suggest that John Kennedy, the 54-year-old male driver, and the pilot, a 49-year-old - who both died in the incident - may have been unaware of this change, as the train was travelling at least 100km/h when it approached the passing loop.
Passenger Leyon Gray told the ABC the train derailed minutes after taking off again after sitting stationary on the tracks.
Dr Rickard said she was stuck on the train for about 10 minutes after it derailed.
The Australian Transport Safety Bureau confirmed thatseveral people had been injured but did not give an exact figure.
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Some passengers claimed they heard an onboard announcement saying the driver was trying to make up for lost time before the crash, but Insp Koger could not confirm this.
Camera IconThe train carriages went "sideways" during the derailment.
The ARTC is in charge of rail maintenance, while the train is managed by Transport for NSW.
Investigators will look at several areas, including whether speed was a factor.
Shaken passengers were bussed to Melbourne after the crash, while others were picked up by family.
A Sydney man described "hanging on for grim death" as the train came off the tracks.
Acting Inspector Peter Fusinato says he expects those people either didn't board the train or left the scene before emergency services arrived.