Is it time to bring back Interlining, but, do it right?
 

Riding the subway, I noticed that most of the train empties at the transfer with lines 1 and 2. Decades ago, they tried to run 2 lines on one set of tracks. As I understand it, it was an abysmal failure.

So, that got me thinking. What if they did it right?

Here is my vision of it:
1) dig 2 tunnel under line 1 from Bloor down to Union on both sides of the U.
2) on the U, the new tunnels would have stations on Queen and College Streets.
3) Line 2 would go through Bay, then turn onto the U, then turn back towards bay and continue.
4) Bay would have 2 levels(They already exist). The top level would be for east west traffic to their terminals, the lower level would be east or west, going to Union.

This would ease congestion on line 1 south of Bloor

Hmm.. interesting idea.

Although it would cost an insane amount of money it would be nice if the Yonge part of Line 1 could be made into a 4 track or double decker tunnel so that there could be a Yonge express train.. say something that only went Richmond Hill Centre -> Finch -> Sheppard -> Eglinton -> St. Clair -> Bloor -> College -> Dundas -> Union or something like that. That's probably an absurdly expensive pipe dream that will never, never, never, ever happen, though, and there's probably much better usages that could be found for that sum.

That would be great. The problem is the true success of the line.

Aren't some of New York's subways set up that way?