>>1308314Well they don't actually cut off the whole line, the work *is* being done in stages just like you suggest. It's bits and pieces disruptions over a month, not an entire month without any train service thankfully. The diagram is just a tad confusing to interpret, that's all.
Also they can't just reopen all of those closed lines, while a lot of the right of way is now parkland parts of it have been sold off or reused like the Chandler Highway bridge. The SRL will also help connect trip generators to the rail network, such as Doncaster and Monash, La Trobe and Deakin Unis,