The European Tribune is a forum for thoughtful dialogue of European and international issues. You are invited to post comments and your own articles.
Please REGISTER to post.
What is the minimum radius of those corridors? Will they support full speed operation, something like 3000 m radius?
With two right angle turns in the approach, and the curve radius for three tracks in a shallow cut and cover tunnel along the street grid, its obviously not a high speed tunnel. I'd expect 5 minutes minimum lost to the traverse between the tunnel mouth and the TBT station throat, leaving the Caltrain run to be 25mins or under to achieve a SF/SJ time of 0:30.
OTOH, they just started getting serious about value engineering at Parsons-Brinkerhoff when it looked like the $100b Year of Expenditure price tag was going to knock the project out due to sticker shock. If the Governor's office puts ongoing pressure on keeping the costs down and performance up, they could still change to siding platform track with high speed switches at the underground 4th and Townsend station and a two track tunnel, which would allow for higher radius curves in the DTX, simpler operation, and pick up a minute or two at a saving of money.
I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.
by Migeru - Jun 15 39 comments
by Frank Schnittger - Jun 17 20 comments
by Katrin - Jun 12 88 comments
by Jerome a Paris - Jun 9 68 comments
by DoDo - Jun 9 22 comments
by Zwackus - Jun 11 64 comments
by Metatone - Jun 8 4 comments
by Ted Welch - Jun 3 1 comment
by Frank Schnittger - Jun 1720 comments
by Migeru - Jun 1539 comments
by Katrin - Jun 1288 comments
by DoDo - Jun 1126 comments
by Zwackus - Jun 1164 comments
by Jerome a Paris - Jun 968 comments
by DoDo - Jun 922 comments
by Metatone - Jun 84 comments
by DoDo - Jun 671 comments
by DoDo - Jun 418 comments
by Ted Welch - Jun 31 comment
by gmoke - Jun 211 comments
by Frank Schnittger - May 3113 comments
by A swedish kind of death - May 3113 comments
by ceebs - May 2927 comments
by ARGeezer - May 2915 comments
by Zwackus - May 271 comment
by DoDo - May 2631 comments
by DoDo - May 2346 comments
by Metatone - May 1490 comments