From a 2013 article on Energy East about converting existing under utilized gas lines and converting them to oil.
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PS - presumably the 500 Mb/d should actually be 0.5 Mbpd or 500,000 bpd. Alberta production is 4 Mbpd.
There are three pipes in the Trans Canada Pipeline corridor at Cochrane. From Cochrane they run south to North Bay.
If one of those lines were converted to oil you could feed Sarnia.
If one of them were diverted to feed an LNG facility at Moosonee you could fill another line.
If you needed another pipe in the corridor the right of way has already been approved, validated and verified through 75 years of service.
If Quebec wants in they would be welcome. But both oil and gas should get to salt water as soon as possible, either in Manitoba or Ontario or both.