The Queensland government may not know how many of the state's troubled new generation of commuter trains will be ready in time for the Commonwealth Games until just before the event.
Two separate investigations are underway into why one of the trains, built in India, came off the tracks during testing at an Ipswich maintenance depot.
It happened on Thursday afternoon as it was being shunted by staff from the train's Canadian manufacturer, Bombardier.
Deputy Premier Jackie Trad said Queensland Rail and the National Rail Safety Regulator are investigating but the incident doesn't appear to have been caused by the train itself.
But there has been a spate of previous problems with the trains.
They were ordered by the former Liberal National Party government but halted by the current Labor government after serious design flaws emerged.
Out of 75 trains in the total order, 15 are on the ground in southeast Queensland undergoing testing.
The government has only officially accepted two of the trains, while the train which derailed is understood to be number 15.
A report in July by German rail operator Deutsche Bahn, commissioned by the government, found that at least 18 of the NGR trains would be needed to bolster the southeast Queensland train timetable for the Games.
Ms Trad on Friday could not commit to all 15 of the trains currently approved or undergoing testing being ready in time.
"We are hoping to get as many as possible that are currently here in Queensland into passenger service," Ms Trad told reporters.
"Now it might not be all of them but as many of them as possible we will try to ensure they are in service to meet the transport task of the Commonwealth Games."
The deputy premier said they likely wouldn't know how many of the NGR trains would be available until as late as March, with the Games to be held in early April.
The government has continued to blame the former LNP government for making the deal with Canadian-owned Bombardier to manufacture the trains in India.
But Opposition Leader Tim Nicholls says the trains he signed off on as treasurer in the Newman government had been changed by Labor.
Mr Nicholls said they will await the outcome of the derailment investigations, but have no confidence the trains will be ready for the Games.
"Under Labor you can't be guaranteed about anything on the rail network," he said on Friday.
"We're already hearing the M1 will be choked for the Commonwealth Games, we've had promises after promises (sic) about the delivery of these trains, but increasingly Labor is failing to deliver."
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