A $50 million contribution from the federal government towards the Woden light rail extension will be spent on design work and approvals for the project, while questions over the route and total cost are hammered out.
The funding, to be included in next week's federal budget, has been allocated in response to the ACT government's most recent infrastructure wishlist.
But the Commonwealth would not confirm whether it will contribute half of the cost of building the Woden light rail extension, a move the ACT government is hoping for.