There are two sites worth checking out if you are a transit fan. The first one is The Yet Better Way by Leif Harmsen who decided to envision the way Toronto’s subway and transit system should look like. He has added subway lines to Eglinton, Queen, and one out to the Zoo. You can download the PDFs — there is one for the east and west side of the city.
The other site is Metro Bits, which has a great collection of art in transit stations from around the world. Toronto’s Sheppard line is showcased, but the real gems are the Prague and Stockholm (image above). I’d consider going to these places just to get a glimpse of these installations.