Originally Posted by mr.x2
i think i get it now but correct me if i'm wrong. The existing Lougheed westbound platform would also be the PMC westbound platform while the currently unused platform would be the PMC's eastbound platform.
Possibly- but not quite. That would mean that westbound PMC trains would travel on the lefthand side track in the station - which isn't North American convention (rules of the road apply).
This is where you get a headache.
Firstly, note the switch right at the east end of the Lougheed platform - shown at the bottom edge of the last Adam Benjamin pic.
That switch could be used to short-turn PMC trains so all PMC passengers only load on and off from the third platform - but then everyone has to go up and down escalators to transfer.
My guess is that the third platform could be used for BOTH westbound M-Line trains AND westbound PMC trains, while the existing centre platform would be used for eastbound M-Line trains on the south side and eastbound PMC trains on the north side. That would easily allow passengers to transfer to the PMC from an M-Line train. However, that may place trains is head-to-head situations at the west end of the station.
i.e. the dilemma is: you can't have westbound M-Line trains remaining on the north side of the centre platform AND westbound PMC trains on the third platform - that would split the frequency between two separate platforms and passengers would get frustrated as to which platform to go to to catch the next train.