rbt
Senior Member
^Will it even be possible to run trains at headway's less than 10-15 minutes?
Well, that depends on what type of service you want to run.
If every train makes all stops, you can run them quite close together as you see on a Metro. If you want an express train to share the same tracks as an all-stop train without impeding the express train, then the all-stop trains must run quite infrequently.
Metrolinx could run all-stop diesel trains every ~4 minutes on a pair of tracks using the signalling strategy currently installed on Georgetown South. Of course, that only leaves 2 tracks for Stouffville/Lake Shore East/Via Rail through Union (4th Union east track is being installed for RER).
Using todays schedules, SCC could get a train every 8 minutes with 2000 seats; or 15_000 seats per direction per hour; nobody would need to stand.
Of course, Union would struggle to handle that passenger load and they'd need to figure out a way of turning trains around at the end points (3 to 4 tail-tracks to enable time for brake-tests/refuelling); but $4B goes a long way to making that possible.
Electrification (planned, kinda) and improved signalling (also largely planned) are both part of RER and make it much easier than with the diesels.
Express service kills capacity of the line on a pair of tracks. The timeslot for a single express train could have 3 to 4 additional all-stop trains instead. IMO, express trains really shouldn't be considered for any corridor with fewer than 3 tracks; though I do understand why it's politically expedient.
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