steveintoronto
Superstar
You earned that! My comment wasn't exactly on tying into Malton, which *appears* to be very logical (I've often thought same myself) but on the loop around the airport not only lending itself to your favoured hub link, but to *any* hub link that may come up. The loop concept alone lends itself many permutations, as Paul ventured, for run-through, or not, (or both!) orThanks for that! So here would be the consensus best option? (p.s. GO City is SmartTrack)
... perhaps Eglinton and Finch could run in opposite directions on this loop, similar to the tube at Heathrow
And taken even further, built in first stage as single track one direction loop, and then when demand increases (or in the initial stage if funding permits) both directions with twin track. Again, this furthers the concept that in an emergency or some need to break the loop (construction, etc) function can still be maintained by having a bi-directional route available even if a detour. The extra cost of twin track will be offset by the increased load of multiple lines feeding the loop. Chicago immediately comes to mind. (IIRC, Melbourne does something similar with a loop for commuter trains in the core) I see a number more posts since I first answered, must read them before commenting further.
Melbourne:
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