I don't need to see the plan to know that the economics of this cannot make any sense.  And note that the GTAA has never tried to sell this plan to private investors.  But now that we have an Canadian Infrastructure slush fund, I mean Bank, have they got a plan for us.  Here is just the beginning of why it doesn't work:

800K people live in London, KW, and Guelph combined. Show me anywhere in the world a financially successful 200 km/hr + high speed train line (it will need dedicated tracks and right of way) that connects such small communities with a major centre. It doesn't exist. Bombardier has been trying for decades to justify a Toronto/Montreal high speed line and it hasn't been able to make the numbers work. So how does Toronto London line even come close. Go to France. The TGV network only connects major centres with cities of more than 1 million. Often there are several on each route.