Really @True Believers, you consider the Melbourne Metro 1000km (and expanding) to be a "legacy network" ? Only in your own delusion will it ever change guage.
SRL at only 90km is the minnow, so why this crazy obsession with the unecessary SG.
And SRL not paying a visit to the Airport. Crazy!
Expecting OS visitor to interchange 5km from the Airport - you really do want to kill off the project.
PS The Airport West tram and 903 bus should run thru to the Airport anyways. That is the easy bit long overdue.
Now you're taking words I didn't say @justarider
. "Only in your own delusion will it ever change gauge." This is complete rubbish, I DIDN'T say the BG network will be converted to SG, I said the SRL line, a completely new segregated line will operate as SG, while the BG network remains the same.
When you have a completely brand new line, you have a free slate without the worry about segregating with the existing one. It could be BG, SG or whatever, it doesn't matter since it's a separate mode of transit (it's going to be a metro). You can also upgrade the Melbourne Metro network to modern standards such as high capacity signalling (modern signalling) and eventually introducing consistency on the fleet on each corridor.
The Airport line will remain BG and the SRL line is SG. I didn't say to convert the Airport line to SG, you're talking about something I clearly didn't say.
And SRL not paying a visit to the Airport is to save on unnecessary tunnelling that would make the western section on the never to-do list. Plus it makes the Airport line more useful, what's the point of duplicating the roles of the Airport line and the SRL between Sunshine and the Airport using the same corridor, that's a complete waste, instead of extending the coverage to Airport west which has potential to be a vital interchange.
Yes, I wholeheartedly agree with extending the trams and buses out to the Airport.
But duplicating the roles like this part of the west makes entirely no sense from an economical standpoint, interchanging isn't a death sentence if both lines operate frequently. The Airport line will make any SRL going towards the Airport redundant if it's using the same corridor. Either it shares part of the corridor or it duplicates the whole corridor, which is more useful?
Even in the maps, the inclusion of the Airport makes the SRL route look indirect and stupid on paper. Why do you think it's better to skip suburbs in the north-west to quality transport when the Airport line already does its job serving the airport, it makes no sense at all.