It's relatively cheap to lay 4km of ground level train track, the delay on this has to do with not wanting to increase the amount of time the level crossings gates are down in Brunswick and North Coburg.
Doubling the frequency of trains means doubling the amount of time the level crossing gates are down.
So they're removing the level crossings through Brunswick by 2030, a few years later they'll do the level crossings in North Coburg and then we'll get a line duplicate a few years after that.
I don't expect the Upfield line to have more than the current 20min frequency until at least 2040.
i.e they're keeping public transport bad because motorists might complain.



