^The flyover concept was part of the
original BCA for RER, see Appendix A4. The bypass came after that document was released.
There were comments from CN objecting to giving CP an ‘advantage’ by putting them on the CN routing. I’m not sure that there was truly anything favourable about that change, but that’s how CN saw thiings.
I have seen comments that suggested that CP wasn’t keen about the bypass either, because the connections to the Mactier Sub around Islington and Steeles were difficult, limiting CP’s ability to route trains and swap blocks between Montreal- Chicago and Toronto-Vancouver lines.
I’m not sure those comments reflected anything material, beyond railways’ typical preference for the devil they know, and/or lobbying for every possible bit of compensation from the taxpayer. Ontario has never had deep enough pockets to buy out both CN and CP, so the bypass, while a darn good idea, never really was grounded in an achievable reality. Maybe our grandchildren will make it happen.
- Paul