Should they have renumbered it - maybe 3S (it makes its curve farther south) or 3A (an alternative to the 3 alignment with similar concept).?
I made a couple of assumptions.
- the NW corner of the cemetery property is not sacred. It appears to contain a scenic pond, and a storage building. I assume this can be dug up and covered over again.
- A tighter curve is not as bad in the proximity of a station than it is mid-way between them. Near a station, the train is still accelerating so it's speed is not as high and the discomfort to the passengers not as great. Mid-way between, the train has already reached speed after leaving the station - then it has to slow down - then speed up again to make it to the next station.
Based on this, I have two options that will get you to the CN Corridor to go under the bridges.
- First, a 300m radius curve from CN, that joins a 400m radius curve to Yonge. The station is where these 2 curves meet - which I know is not desirable to have a station (Langstaff) on a curve and a compound curve (a cork screw at that to honour the nearby Dragon Fyre roller coaster).
- Next a 250m radius curve from CN, then a short tangent section for the Langstaff Station, then the 400m radius curve to Yonge.
My main goal is to build along Yonge using cut-and-cover and still make it to grade (or close to it) and utilize the existing 407 bridges. In terms of vertical elevation, I think it would only make it to grade at the Langstaff GO station. I think the cemetery would complain a lot more about a TMB launch site immediately on their doorstep than a relatively quick cut-and-cover operation that briefly occupies the corner of their property.
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RE: Elevated. The most notable elevated transit in Toronto is the SRT in the STC vicinity. It is also the most built-up area of the entire line.
For Ontario Line, although some complain about the elevation - other complain about taking up valuable space in the GO corridor, not actually saving that much money with all the portals and TBM launches required.
The one thing Metrolinx has not considered is cut-and-cover. It seems fine to do it for stations - where the disruption is maybe 5 years. But for linear track where, with precast components, the disruption would be measured in months - they refuse to consider it.
If I lived in the area I would much rather have cut-and-cover for a few months, plus an extra station (with 3 years construction), than to have a subway roar through 100' below ground and no station within walking distance.
(I agree that elevated doesn't work here, and the only at-grade portion should be in the Rail corridor - if it makes it there).