denfromoakvillemilton
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If hourly two-way service goes only as far as Mount Pleasant, it should be simple for GO to schedule off-peak trains in such a way that there would only be one train west of Bramalea at any one time (peak periods excepted) - the GO schedule provides 14 minutes for a train to leave Bramalea and arrive at Mount Pleasant, where it would require a 10-15 minute layover for brake check and crew positioning. Say if the train leaves Bramalea at 9:00, it would arrive at Mount Pleasant at 9:15, depart eastbound at 9:30, and be back at Bramalea at 9:45 and soon on the Weston Sub. CN would still have effectively a mainline track and long passing sidings to itself (two mainline tracks to itself east of Kennedy Road), plus the track unoccupied by GO as it sits at Mount Pleasant.
Even with 10-15 minutes leeway for delays, only one GO train need occupy the Halton Sub at any one time, with the exception of 6:15 to 8:45 and 16:15 though 18:45 or so, when there would likely be two or three trains operating - say 10/15/30 minute service in the peak direction (depending on how GO wishes to schedule its trains) and 30-60 minute service in the off-peak direction. Even in peak hours, GO can handle some increased demand with local trains from Bramalea (paired with express trains from Kitchener and Georgetown) that wouldn't even touch the Halton Sub if it used the third layover track. There's also room on the north/east side of the station for another freight track.
For 30 minute service, which would really be useful (60 minutes just being okay), the third track though downtown Brampton would definitely be needed - this is work that I would support, though it would be very expensive - utility relocation, widening Centre Street, Etobicoke Creek, Queen Street, Union Street, Main Street bridges, as well as widening the embankment, moving the station (and probably the old freight/baggage house), rebuilding the platform, rebuilding the John and Mill Street grade crossings and associated track and signal work.
It appears that not committing to AD2W service (hourly off peak) is either a case of letting the search for perfection get in the way of pretty good or there really is no will to do it so if, after spending $1.3B already, you suggest there needs to be 3 or 4 tracks and it will take another 5 years and another $1.1B....people will just go "ah well, it would be nice but not possible".
I grow more skeptical by the day that I will see AD2W service on this line during my working life and I suspect that when the Hurontario LRT is built and the YUS subway extension opens, Bramptonians will just be pointed in those directions and told "see, we gave you all day service'.....hope I am wrong but it is a growing uneasy feeling.
If GO was serious about it, it would technically require zero additional infrastructure to run all day two way, hourly service to Mount Pleasant (plus current and some additional peak-direction trains) once the work on the Weston Sub is finished. This fact needs to be pushed and pushed hard.
Well I believe there is no will honestly. They could have upgraded all the corridors 5 years ago, they didn't. Even Milton it should not have been that expensive in 2007 to lay a forth track. Markham, Barrie and Richmond Hill is worse because they own all of those corridors.
At this point, they should come out and say either Union Station is full or its just not a priority.
Having said this, if CN wants the new track, they should get it. If go does not own the line they have to play ball.