The business case states that Metrolinx and ONTC will work together to deliver the (south portion of) the service. It would be cool if in exchange for waiving track fees on Metrolinx tracks, ONR would accept GO tickets between Gormley and Toronto. That would be similar to how Coaster commuter rail tickets are accepted on Amtrak trips between Oceanside and San Diego.
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The number of GO passengers using the ONR train would probably be fairly low, since the ONR trips will be be outside of the peak periods, only stop at two RH line stations, and the RH line is not that busy to begin with. So the GO passengers on the trips might be low enough to equal the number of ONR passengers getting off at Gormley and RHC/Langstaff. It would be a neat addition to the Richmond Hill line's span of train service.
Current Richmond Hill line schedule, showing Northlander service as described in the business case. ONR departure times are based on 12h20 travel time to Cochrane, with a1-hour connection time to the Polar Bear train. Southbound Polar Bear would be shifted 1 hour earlier to improve southbound Northlander departure times for northern communities.
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This fare agreement would allow one Union-Langstaff GO bus trip per direction to be cancelled. The existing Union-Bloomington bus trips would remain.
It would be nice if the train stopped at Bloomington rather than Gormley, to get some more use out of that severely overbuilt station and provide better access to Aurora and Newmarket. But it's possible that the benefits of the station over Gormley are not sufficient to justify the cost of connecting the north end of GO track to the mainline (it currently dead-ends at the station).