The government has confirmed the former GoPrint site at Wooloongabba will be transformed into a Cross River Rail stop and an interchange with Brisbane City Council's Brisbane Metro.

Tuesday's state budget allocated an additional $1.95 billion towards the $5.4 billion project, allowing the development to move ahead despite the reluctance of the Turmbull government to help fund it.

But Deputy Premier Jackie Trad insisted the government was still chasing the federal government to contribute.

"It is time for Malcolm Turnbull to come to the party, but we're not waiting for him," Ms Trad told reporters on Wednesday.

"What this means is that we can move forward as a new world city, with a world-class public transport system, with the state government and Brisbane city council working hand in hand to unclog some of the critical choke points in our transport system."

Opposition leader Tim Nicholls claimed the actual cost of the project would be much more than $5.4 billion, and the government was being reckless by going it alone.

"The cost of Cross River Rail is going to be more like $14 billion," he said.

"It would be like building a hospital and not having the beds and the doctors."

But Ms Trad says outlining the capital investment has always been the standard way of costing projects, including when the Liberal National Party was in office.

The government says the ongoing cost of the project would be met through a number of means, including federal funding and private sector investment.

Work is expected to start on the Woolloongabba station in September this year, ramping up to December.