Cold, rainy day, so time for a new map. Possibly my best yet.
Some notes:
1) Each colour represents a separate, full service subway line. There are 7 lines and 130 stations.
2) Where two lines run parallel to each other, there is a 4 track alignment consisting of one local line, and one express line.
3) At single line segments, all trains stop at all black dots.
4) At dual line segments, local trains stop at both small and large dots. Express trains only stop at large dots.
5) The super node is relocated from Yonge and Bloor to Yonge and Dundas. Four lines service Yonge and Dundas.
Advantages:
1) Pearson Airport is 6 stops away from downtown, via the light blue line, and also accessible along Eglinton.
2) Yonge line gets express service south of Eglinton.
3) There is a DRL from the east and west offering both express and local service to downtown. The existing Dufferin and approximately Coxwell stations on BD are only 3 stops away from downtown via an express train.
Quick disclaimer:
1) My familiarity with the city drops off substantially outside of central Toronto and North York. If a subway line or a station should more logically be a few streets over, it's an innocent mistake. I probably even missed a few existing stops on Bloor or put them in the wrong place.
2) I chose Dundas as the downtown subway corridor, but it could just as easily be Queen St. I just think that Dundas Square is a better spot for the main transfer point than Queen for whatever reason.