Quote:
Originally Posted by Dado
I've been measuring this again and again and while it is larger than the 50 m I thought it was it's still not 100 m. I'd guess 90, maybe 95 m. The reason I said 50-60 m is because that's the radius I could get without running into significant geological problems. The alignment you've got places it underneath a rather steep slope. You've got part of it cutting underneath the parking lot of the dry cleaners at the top of the hill (NW corner at Byron and Churchill). Granted, it would be much lower than that but the problem is digging it in the first place - you'll have an entire slope to stabilize somehow. The Byron (former tramway) embankment would also have to be stabilized to dig under it.
I see what you're trying to do but it's not going to come cheap or easy. Any savings from pre-dropping cut and cover sections into Churchill are going to disappear trying to get that curve into Danforth.
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Yes, the tightest curve is probably going to be a little less than 100m radius; you are right.
How much would it cost to expropriate the Drycleaner too? If the building weren't there, then it would be cheaper to work under that hill. Could a steel wall be pounded in along the working line to shore up the hill and save the building? I don't know what is holding up the edge of that hill now, do you?
Any idea what is in the other building on Danforth, behind the drycleaner? It's marked with an X on my picture. I don't think it would cost too much to expropriate it.
If the tunnel north of Richmond could be done economically while other work was being done, then I'm thinking about maybe $10M-15M for the south section. On second thought, the train will need to be under Byron for a bit so that becomes a bit more expensive. I don't know how the cost would compare to running the train in a trench through the Rochester Field (which would probably be covered for a park), and a new structure to get it to the south of Richmond Road. Going through the Rochester Field also moves the station to the north of the future high-density development north of Richmond. This is a bit out of the way for the Westboro shopping district.
It comes down to a choice of which is more important, commuters to downtown, or connecting pedestrian spaces. This is not the only area which will be a compromise, as most of the transit system will be, but it is an area where a solution with a slightly higher price might be better able to satisfy both sides. Think about the cost being amortized over 100 years.