Seems that there are lots of ideas how to do a re-config.
What am I missing. Has anybody actually put a case for "why ???"
What is the purpose of "straighten out the loop" ?
It guarantees that nobody on the Frankston or Craigeburn lines can stop at FSS or SCS.
EDIT: also pax on Dandenong line, post MM1, cannot stop at SCS(from swap at Caulfield)
So too bad for a big chunk of pax, but good news to the handful (if any) that need to get from Frankston(line) to Craigeburn(line).
Where the hell are those 40,000 supposed to go?
The point is that instead of having two lines on each side of the city joining and creating a bottle neck (which reduces paths into the City), you join lines at the City to create through-routes that maintains capacity.
So the thee through-routed pairs become:
Sandringham - Newport
Burnley Local to Upfield
Frankston to Craigieburn
Clifton Loop and Burnley Loop remain, so one of the pairs above goes via the loop.
Sandringham - Newport makes most sense given F-C could sustain HCMTs
Then at Newport, you can separate that into two, Newport Local (Williamstown and Point Cook via Altona) and Newport Express (Werribee/WV and Geelong), with Newport Local going as above and Newport Express going to Clifton Hill via Metro 2 connecting to the Mernda Line.
Then you look at having Burnley Local become full time Glen Waverley with Burnley Express being converted into Box Hill Local, with a Box Hill Express (four tracks Burnley to Box Hill, Local to Box Hill/Alamein/Oakleigh). The Box Hill Express would tunnel from Burnley to create Metro 3, another cross city route, probably to Sunshine to take some pressure of all the lines running through Metro 1 (Airport, Sunbury, Melton, WV)
All of this is to say that through-routing train lines is the most efficient for maximising peak capacity. At 2am it's a waste of money, but between 7a and 10a, 4p and 7p, we need every train we can get going through the core. We have ample track space except for the few single track sections, but in the core we need each sector to have dedicated tracks the whole way through.