With the opening of Line 6 Finch West LRT in Toronto (not to mentioning the soon* to open line 5) the in game map of the Toronto transit system is no longer an accurate potential future system in the Overwatch universe. Unless there is some lore based reason that the Canadian government would remove the Line 6 and replace it with the pink and blue lines in the Overwatch version, but this would be very expensive and redundant and they create very indirect connections to Line 1 which is currently the backbone of the system.

Maybe Null sector destroyed Line 6 at some point??

https://preview.redd.it/neq4en6j7m8g1.jpg?width=2367&format=pjpg&auto=webp&s=2e6fb8ec5200f6c387902c7ca065ac15d7fb0d92