The Rail, Train and Bus Union this morning said the crash happened over the section of track that V/Line drivers had banned just this week.
The male driver, and the female pilot, 49, from Castlemaine, Victoria, lost their lives after the XPT train and five carriages came off the tracks at around 8:00 pm on its way to Melbourne from Sydney.
Investigations are continuing at the site of the train derailment in Melbourne's north that left two people dead.
About 160 passengers were on board when it derailed.
The incident has caused severe disruption on the line, with several trains scheduled to enter or depart Melbourne canceled.
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Ms Ryan raised concerns about the line with state Public Transport Minister Melissa Horne as recently as Tuesday in parliament after another train derailment further up the line in January.
Two people were killed Thursday when a passenger train derailed in southeastern Australia, authorities said.
"Conditions were altered and V/Line drivers rightly refused to traverse this section over the past week".
It was running more than two hours late at the time of the crash.
A crime scene has been established. The Australian Rail Track Corporation is in charge of rail maintenance, while the train is managed by Transport for NSW.
Rail insiders surmise that the XPT driver and the pilot - a contractor brought onto trains to assist drivers when there are no operating signals - may have been relying on old advice to avoid the passing loop and continue along the main line at regular speed.