I'd imagine you can't just cut and cover centre, anyway. It's not just dirt. You are relocating loads of utilities all the way up. I remember when they did the 16th ave intersection and it took forever for them to replace all the lines. And this wouldn't just be replacing, you would have to move them somewhere. At least with a TBM you can go deeper and not worry, though the station would still involve a lot of work, I suspect. That's why elevated saves so much money(in my mind!). Just don't use Edmonton concrete contractors and engineers.
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