Quote:
Originally Posted by LeftCoaster
I dont mind the alignment, but if you are going to drop a lot of cash putting a tunnel through new west, why go along the river then cross at the pautello? Just cross at the alex fraser. There is a ton of land to build at grade tracks on Annacis island and through queensburough, then tunnel through new west and out to the tracks on the other side of Burnaby Lake. It would be a straigher even more direct route and likely wouldnt cost any more, allowing the trains to continue at high speed until the false creek flats.
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Bridges are expensive and I figured better one bridge than three. I was also thinking in terms of the likelihood that there's no money for a tunnel (yet), in which case we have to follow the existing tracks around Braid, Sapperton, etc. There are 2 essentials that must be provided on the Vancouver end for the US to agree to extending HSR up here: that is a new bridge over the fraser and a shortcut around/thru White Rock.
For the latter, I disagree with Stingray. The only alignment near the border has to be at the Peach Arch crossing, because immediately east of it are hills going up to 300 feet in elevation where it's aligned with 184th in Surrey, (and goes even higher further east). Given that, without making a massive detour to the east and back to the west, the most gentle grade north of Peach Arch is along Hwy 99. Maybe lower sections are elevated and the highest point of the track is trenched.
I no longer like the tunnel-under-new-west idea. A tunnel under Knight Street (cut&cover 1 block west that is) would be the same length (approx 6km). The benefits of the latter alignment make a more worthwhile difference. Which makes the project impossible to do Vancouver-style... ie: in phases. If we can only afford the White Rock shortcut and a replacement bridge over the Fraser, it will follow the eastern route around New West/Burnaby, and the western tunnel idea is out the window, forever.
OR unless it's something simliar to what LeftCoaster suggests, perhaps one big viaduct over Annacis Island and Queensborough, terminating right in the middle of Big Bend. Phase 1 will have the tracks after the viaduct curving right to New West. The western tunnel can be phased in as below, beginning after Boundary road and cutting diagonally across East Van to rejoin the grandview cut:
It has to be a bored tunnel... the north-south roads in Vancouver aren't straight enough for cut-and-cover. But note that the difference between the 2 methods might be less than $100 million in this case:
FYI
Subway Construction Method Cost (in millions) per Kilometre
Major Bridging ---------------------- $350
Other Significant Bridging ----------- $100
Bored Tunnel ---------------------- $86.2
Cut and Cover --------------------- $72.4
Elevated -------------------------- $43.1
At Grade -------------------------- $22.6
Stats based on Toronto subways. Cool website for costing estimates:
http://www.drlnow.ca/costanalysis.html
HSR is typically in the $30M/km range. The existing route would be 59km from downtown to the US border, 45km with the above route + shortcut across White Rock.