Overall, it's planned to double public transport trips citywide from 70 million to 140 million in the next 10 years.
Of course not all of those extra commuters will end up in the CBD, but without increased capacity on the trains - the loop will double the number of trains able to use the downtown Britomart station - the vast majority of those who do will have to squeeze into buses to get there.
If you think parts of downtown are unpleasant places in peak hours because of noisy, diesel-belching buses, imagine double the number in the same space.
I had gone searching to see if Queen Elizabeth Square outside the Britomart train station had been rescued from its present fate as the de facto main bus station. It seems not, though the stylised charts do fudge the details.
What is alarming is the fate of Queen St, which in 2007 got a $40 million makeover, complete with nikau palms and Chinese granite paving. It is now marked as "Rapid Transit". Presumably that means a busway rather than railway - the proposed tunnel to run further west under Albert St.
The golden shopping mile is also identified as part of the "frequent service network". Seeking definitions, we're told "rapid services ... have exclusive access to their own rights of way along high-density corridors".
As for "frequent services", the draft explains "the core element of the new system will be the frequent service network which will provide all-day high- frequency services at least every 15 minutes".
In other words, Queen St, including Queen Elizabeth Square, is being identified as having an exclusive busway inserted into it.
The devil is, as always, in the detail. How many buses are they talking about and how exclusive a lane?
A year ago, when the city planners unveiled their city centre masterplan, they rebuffed the mayor's desire to turn Queen St into a mall, saying it "might be an unnecessary and overly expensive step".
They said "desired outcomes could be delivered through a shared space approach with buses, service vehicles and local traffic ... sharing the street with pedestrians'.'
Even if we regard ourselves as more nimble on our feet than Wellingtonians, the experience of bus versus pedestrians in the capital when the two share the same street is a lesson we'd be foolhardy to ignore. Bus drivers on split shifts with impossible timetables and scurrying jaywalkers are not a good mix.
What the plan does highlight is that if Auckland plans to double the number of commuters on public transport, the extra buses and carriages have to go somewhere, particularly in the confined area of the CBD.
Last year, in arguing the case with a reluctant Government, Auckland transport planners claimed that without the rail loop, Auckland would by 2041 need an exclusive busway, four lanes wide, running out of the city.
"In many circumstances in Auckland this would take the entire width of the roadway and effectively stop all general traffic from using those roads," they said.
They were talking of routes like Hobson St. Now it seems even Queen St is not safe.
