A few things have happened since May on the Metro Tunnel project.
The Victorian Government has submitted its annual wish list to Infrastructure Australia (Federal body which chooses transportation projects to fund based on merit/the case the various state governments submit) and Metro Tunnel and the Dandenong Corridor project are in their top priority along with a ridiculously expensive inner north road tunnel.
Also yesterday, PTV (main PT body in Victoria) released working documents on the future operation of the rail network post Regional Rail Project (U/C now) and what the rail network would look like post Metro Tunnel project
DAniel Bowen (Public Transport Users Association - a PT lobby group in Vic) summarised it here:
http://www.danielbowen.com/2012/08/1...rations-draft/
As has been talked about in this thread so far, Melbourne's current rail network works on 4 groups of lines: Northern, Caulfield, Burnley and Clifton Hill group - RRL and Metro Tunnel focus almost exclusively on the Caulfield and Northern Groups.
At present, on that pic above, Pakenham/Cranbourne/Frankston all compete for space in the city loop - post Metro the lines would be separated with Frankston having exclusive use of the current loop/underground infrastructure @ 18TPH in peak. Pakenham/Cranbourne would be through-routed on the new metro tunnel to Sunbury and Melton (which requires another electification project from Sunshine along the Ballarat (regional) line). Sandringham would utilise the existing 2 through tracks alongside the city loop and get through-routed to Williamstown and Werribee. Craigeburn and Upfield would get exclusive use of the current Northern Loop which is currently shared with Sydenham (now Sunbury) line - and which up until about 2 years ago Werribee was also using the current loop/underground infrastructure.
The released reports reaffirm what's been reported already - by 2022 all branch lines will have at least 15 minute off peak frequencies and 10 minute peak frequencies, but looking at that diagram and comparing to the current timetable the frequency (peak) increases are massive across the board
2010 timetable: 46 trains per hour (from Craigieburn, Upfield, Melton, Sunbury, Werribee and Dandenong)
With upgrades including RRL: 61 tph
With MM1: 75 tph
With MM1 and Melton electrification/duplication: 80 tph
With MM1 + MM2 including Dandenong line upgrades: 86 tph
With MM1 + MM2 + 9-car trains: 109 tph (equivalent)
What this all means: there's currently 46 trains an hour from the existing Craigieburn, Upfield, Sydenham (Sunbury), Werribee and Dandenong areas going to their respective loops. When the Regional Rail Link project is finished, there'll be capacity for another 15TPH (to 61TPH total), MM1 and MM2 relate to the old proposal of two phase tunnel, but the new state government has made it one phase albeit over a shorter route - a further 15TPH in capacity is added with this tunnel and then further improvements are made when the whole Dandenong corridor is upgraded (which requires a lot of level cross grade separation).
Plus - the Pakenham/Cranbourne (Dandenong) to Melton/Sunbury (Sunshine) section station platforms will all be lengthened (the new metro tunnel will be built with 250m long platforms!) to cater for 9 car trains (we only do 6 car at the moment) so that explains the "equivalent" capacity increase to 109TPH (realistically it'll be 86 actual trains an hour, but as each train will be 1/3 longer than current config the extra capacity is reflected in an equivalent of 109TPH on both groups.
22-26TPH on the new Metro Tunnel route (trains literally start on the western and north western edges, and traverse the whole city to the south east: end to end journeys would be around the 80km mark, broken down:
Peak operations (from docs) on specific routes:
8TPH Sunbury-Cranbourne
8TPH Melton-Pakenham
4TPH Rockbank-Pakenham (Rockbank is on the Melton line)
6TPH Sydenham-Westall or Dandenong (Sydenham is the current terminus of the Sunbury line - until the Sunbury electrification extension opens in November, and Westall is between Dandenong and Oakleigh - both these stations have large train storage and maintenance facilities).
26TPH / train every 2.3 minutes in peak
Off-peak (my assumption based on previously reported frequencies)
4TPH Sunbury-Cranbourne
4TPH Melton-Pakenham
4TPH Sydenham-Westall or Dandenong
12 TPH / train every 5 minutes off peak.
And the Frankston, Werribee/Sandringham, Craigieburn/Upfield frequencies are about double what currently runs in the present timetable!
And that, ladies and gents, is how you turn 100 year old rail corridors into fully fledged metros or "subways" as you call them around these parts.
Just hope they fund the project