Sheppard LRT: $63 million per km. Spadina Subway is $302 million per km. Even if you cut that in half, you're still more than double the LRT cost.
If stations on the Spadina line weren't built to rival European Cathedrals, the costs per km would be significantly lower, more like $250 or even $200 per km. When you have $125 million dollar stations that could be built for $30 million, there's no excuse.
Also, it's been said before, several parts of subway-able lines could be constructed for a significantly lower price by using alternate construction techniques. Trenching through the Richview corridor, raised guideway east of Don Mills on Eglinton and north of Eglinton for the DRL. These could lower
significantly to the point that you'd be the laughing stock if you said we should build LRT instead. But the TTC has done a great job of brainwashing people that all subway is either gold-plated and over $300 million per km, or isn't right to build.
The airport is getting a heavy rail connection: Union Pearson Air Rail Link. Again, feel free to debate semantics.
Leading stop-free straight into downtown. If you don't think there's a market for travel outside of downtown, especially with the extremely decentralized development, density, and employment in the city, then you need to take a nice drive around sometime.
Monterrey, Boston, Calgary, Guadalajara, San Francisco, Los Angeles, Portland, Philadelphia, San Diego, Mexico City, Dallas, Denver, Newark, Saint Louis, Sacramento, Salt Lake City, Baltimore, Phoenix, Edmonton, San Jose, Minneapolis, Houston, Pittsburgh, Buffalo, Charlotte, Seattle, New Orleans, Ottawa, Cleveland, Oceanside, Memphis, Seattle & Tampa *must* all be tiny towns masquerading as big cities. Either that or you need to start making some phone calls to tell planners in these cities that they're stupid.
Alright, where to start.
Monterrey's LRT network is really more like a metro; the lines are
fully grade separated and there are true stations that you would expect on any other subway line in the world. This is the same for Calgary and Edmonton, as well as several of San Francisco's LRT lines, which has at least a partially developed BART as a metro.
Boston and Philadelphia both have quite well developed rapid transit (i.e. subway,) already, and so LRT is only filling in the gaps in their network, as it's supposed to. As for Salt Lake City, Phoenix, Denver, Dallas, Los Angles, San Diego, Minneapolis, Houston, Buffalo Charlotte, and Tampa, I'm actually kind of disgusted that you put those systems up as examples of successful transit systems. Okay, I guess they do have LRT lines, but is it really successful as a transit system? In all those cities, there is an insane amount of car usage, much more than we have here in Toronto.
Ottawa and Pittsburgh are both places where LRT has not worked out, but BRT has. Sorry, but the O-Train doesn't even count as LRT. I might be tempted to give this to you, but the BRT network way of building requires more BRTs than even Transit City is building (LRTs, whatever,) and that would be for a city like Pittsburgh, around 2 million people. Curitiba, the beautifully cut gem showing what a good BRT network can do, only has a metro pop of 3.5 million people, and has over 20 BRT lines. The GTA has almost twice that population, and the GGH has 2.5 times that. And the GGH is expected to have anywhere between 3 and 4 times that population within 25 years. Growth in Curitiba is quite stable and has been for quite a while, and I don't think that following those footsteps while we've already gone 20 years of transit construction away from that method and are already past the range where it would ever work, along with a half-assed attempt by those standards, are certainly not a way to build transit as the city's future.
My last beef here is Mexico City. I think you might have missed when you were searching through wikipedia "LRT lines in North America" that Mexico City ranks high in the world as one of the most developed subway systems, didn't you? It has over 10 metro lines on top of a developing LRT system which, once again, fills in the gaps through the subway system. Mexico City is also continuing to build more metro lines and is in the middle of an extension right now.