Also, grade separations add capacity to car drivers and pedestrians, not GO.
GO already has full priority at all intersections. They can run trains every 5 minutes without a grade separation perfectly well, but everything else will come to a complete halt. Rail-Street grade separations should be in the roadways budget accounting wise as they add capacity to the roadways, not the railways.
Both may need to work towards it.
But it's noteworthy that one of the criteria for permitting lighter trains on GO's network (e.g. European style SmartTrack trains) may require grade separations. Transport Canada is open to non-FRA EMUs on GO's network under certain conditions, though it is mainly pertaining to freight separation as well as possibly some form of
Positive Train Control.
If this is the only way to get SmartTrack to proceed with lightweight EMUs, then it is fully possible that Metrolinx needs to proceed with all the grade separations necessary to pull off introduction of lightweight EMU cars that are otherwise at risk of killing passengers without being built to FRA standards.
In Canada/USA we go with protection by overbuilding the coach like a tank, while in Europe they appear to go with protection by avoiding things from happening (e.g. avoiding level crossings on critical commuter routes, using Positive Train Control, etc). The SmartTrack EMUs that have from time to time been proposed, are lighter weight EMUs -- not LRT types. Some of the Metrolinx pictograms have been the
Stadler KISS trainset -- a non-FRA compliant EMU not currently allowed to run on Canadian railroads but that Transport Canada has indicated an openness (in some Metrolinx PDFs) to under certain criteria (i.e. making the GO network grade/road/freight separated, or other as-yet-undecided criteria).
Kind of a Catch-22.
So Metrolinx might simply have choice but to pay for many of the grade separations for a quick Transport Canada approval of whatever shiny EMU electric train Metrolinx buys for the dense-infilled-station routes like SmartTrack. With our train choices starting to gradually limit as they might not want to go with Bombardier this time, given their delays delivering to TTC and New York Subway, etc (they're also steaming mad at Bombardier, too). Our choices of trains greatly expand if we eliminate the FRA requirement -- by making the SmartTrack route completely grade separated (if that should be a pre-requisite enforced by Transport Canada to permit lightweight EMUs).
But that might be moot. It's ultimately the same pocket (taxpayer), just a different budget. I hope proper funding is raised though -- the next Fed government may provide a route to an alternate solution to the Hydro One sale, for example (not the ideal source of fund -- personally I'd prefer careful/creative road tolling, and/or a single percent extra sales tax going 100% to transit, etc. Both highly unpopular ideas -- but would be less unpopular for many than Hydro One sale).
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Related Topic: Whatever next feds get elected, need to re-expand Transport Canada to accommodate Metrolinx's big ask of approving any EMU order, relating to any GO RER projects such as SmartTrack... After the Transport Canada cuts by Harper, re-staffing is needed -- stat -- begin now -- or we're just running SmartTrack GO RER section with the 12-car bilevels and it won't be terribly fast at all the infill station spacing, even with electric locomotives.