There are additionally some technical challenges about how the rail runs previous Parliament Home.
“Our preliminary investigations on a State Circle alignment present that the tracks would want to maneuver from the median of Commonwealth Avenue right down to State Circle with out interfering with the Commonwealth Avenue ramp as much as Parliament Home,” she mentioned.
Authorities should additionally work out how the tracks are introduced from State Circle again as much as Adelaide Avenue, with “vital gradient points” on this location.
“The gradient from State Circle to Adelaide Avenue may be very steep. This might probably be mitigated by flattening the grade at Adelaide Avenue or transitioning between State Circle and Capital Circle at Canberra Avenue,” she mentioned.
“The curvature of State Circle additionally makes the position of stops difficult, and will affect on the symmetry of the highway scheme.
“We’ll now do extra work to analyse these technical questions in rather more element.
The federal government spokeswoman mentioned whereas the State Circle alignment had some technical challenges that might must be labored by way of, any route would have issues to beat.
“Stage one had a lot of challenges, together with the elimination of bushes, land use impacts and noise from building works, as does the potential stage two route by way of Barton,” she mentioned.
“A very powerful issue is how we strategy these challenges, with our give attention to how we will ship mild rail to Woden as rapidly as doable.”
The Barr authorities introduced in April the Barton route, which runs previous Outdated Parliament Home, was their most popular method to take mild rail from Civic to Woden.
Nonetheless State Circle turned a reside choice, after a federal parliamentary committee discovered that slicing throughout the Parliamentary Triangle would result in time delays and value blowouts in getting the undertaking authorized.
The committee pointed to State Circle as a possible approach ahead, because the alignment is marked as an inter-town transport hall within the Nationwide Capital Plan.
Mr Barr mentioned whereas Barton was nonetheless their most popular route he wouldn’t permit “excellent to be the enemy of excellent”, and State Circle was the “path of least resistance” in getting the undertaking authorized.
State Circle was additionally checked out as a part of a guide’s report on choices for mild rail stage two, nevertheless a Capital Circle alignment – which sits inside State Circle – ended up being considered one of two choices put out for a public vote (the survey discovered almost three-quarters of respondents most popular the Barton route).
Nonetheless the federal government is pushing ahead with each choices for now, and can refer each the Barton and State Circle routes to the federal surroundings minister below the Surroundings Safety and Biodiversity Conservation Act doubtless early within the new yr.
The minister then has 20 days to determine whether or not a proper environmental affect evaluation is required.
Katie Burgess is a reporter for the Canberra Occasions, overlaying ACT politics.