Broadway Subway - Millennium Line Extension to Arbutus | U/C

[Unregistered User]

Originally Posted by ilikeredheads

It creates more problems than it solves that's why you don't see transit systems anywhere in the world do this.

They do this in London, no?

[Unregistered User]

Originally Posted by Tvisforme

This might be a silly question, but what is the overall length limit for SkyTrain cars that allow walk-through (IIRC Mark II and newer) and also on the Canada Line? I'm just curious if it is possible to increase carrying capacity by using trains that are slightly longer than the stations - perhaps one extra car - and having the doors at the far ends of the train stay closed? Passengers at teh ends of the train would have to walk half a car, but that's not too onerous if it means more capacity.

Instead of:

[ O O ][ O O ][ O O ][ O O ]
+--------------------------+

run them as:

[ X O ][ O O ][ O O ][ O O ][ O X ]
++++---------------------------++++

("O" = opening doors, "X" = closed door, "-" = platform, "+" = end of platform)

I'd much prefer they do this for the Canada Line using full-sized 20 metre middle cars rather than the truncated 10 metre C-cars that have been proposed for any capacity expansion. A 60 metre Canada Line train would fill a 50 metre platform with only *one* set of doors at one of the ends being inaccessible. You could establish that the end section of the trains are for "long-haulers" who are riding from terminus to terminus (maybe the seats in that section could be a different colour to signal that there is something special about it) or more daringly: set up some sort of a system where which end hangs off the edge of the platform alternates from station to station. I think the inconvenience of either would be a reasonable price to pay for a 50% increase in capacity.

[MistyMountain]

Originally Posted by Unregistered User

They do this in London, no?

They do it in London where it is physically impossible to extend the platforms, for instance where it would cut into other lines. It's not a great solution because it severely limits capacity.

When you do that you don't get the full additional peak capacity granted by the additional car because the rate people can get on and off is limited.

[swimmer_spe]

Originally Posted by Migrant_Coconut

I figure it's also a bad idea in case of an emergency - can you imagine all the car's passengers rushing for the same door? Half a car extra, at the most.

Yet over on the Heavy Rail thread you tout that they can be extended no problem.

[Migrant_Coconut]

Originally Posted by swimmer_spe

Yet over on the Heavy Rail thread you tout that they can be extended no problem.

They can, as soon as we lengthen the stations; at the moment, the stations are long enough and the problem is lack of cars. Even you have to realize how petty you're being at the moment.

[swimmer_spe]

Originally Posted by Migrant_Coconut

They can, as soon as we lengthen the stations; at the moment, the stations are long enough and the problem is lack of cars. Even you have to realize how petty you're being at the moment.

How do you extend a tunnel station if there are no knock out sections?

[madog222]

Originally Posted by swimmer_spe

How do you extend a tunnel station if there are no knock out sections?

By digging.

[Dave2]

Originally Posted by Unregistered User

They do this in London, no?

Until relatively recently they did something similar in New York on the 1 line at South Ferry. Only the first five (of eight iirc) cars had access to the platforms.

[swimmer_spe]

Originally Posted by madog222

By digging.

Very expensive digging.

[NicholasHui]

They are going to have 4 through lanes on the traffic deck completed by the morning of October 22. Soon after they are going to do the bulk excavation and building the station.

[jollyburger]

Originally Posted by NicholasHui

They are going to have 4 through lanes on the traffic deck completed by the morning of October 22. Soon after they are going to do the bulk excavation and building the station.

That's the Oak Street notice? Seems like a few more weeks to complete the Cambie sewer work in the middle of the road.

[Hooknose]

Since the TBM started Saturday 10 days ago, it should have "disappeared" already down a tunnel of its own making.

Does anyone have an image of how much of the TBM is still visible, if any.

In the rapid transit of the golf phrase, "you put for money but you drive for show"..perhaps we could say, "you tunnel for importance but you lay track for show" ... or something like this.
Have fun with this, if you like.

[WarrenC12]

Given the distance and the 1 year time frame, it should be doing around 15-18m/day by my math.

[madog222]

I walked past today, there’s about 50m of TBM sticking out so it’s progressed around 100 meters.

[Hooknose]

Originally Posted by madog222

I walked past today, there’s about 50m of TBM sticking out so it’s progressed around 100 meters.

The rated performance is about 18 meters a day. If after 10 days or so , only 100 meters are already built, then they are just warming it up.

Probably smart.

If there is a glitch or two or ten, it is better to find that out now while the TBM is within reach of daylight and easy access to any maintenance facilities required.

I suspect, in a week or three, they can speed it up as they establish their regular pace.

[Zepfancouver]

Today



I'm not sure if they're still feeding the tube with machinery or if that's the back end of the boring machine or it's a ventilate machine at the end of that tube.



Driving home I took a detour to check out our tunnelling machine and spotted a rebar cage going up on Fraser St. took a hard right and to my excitement their were installing it.


https://makeagif.com/i/GYv-NL

Sights and Sounds

• Video Link

[jollyburger]

I guess those concrete tunnel liners and red steel cage is where the portal starts?

[madog222]

Originally Posted by Zepfancouver

I'm not sure if they're still feeding the tube with machinery or if that's the back end of the boring machine or it's a ventilate machine at the end of that tube.

I had a closer look today. That's the tail end of the TBM, last piece under the white tarp. It's mounted on rollers on a track, just visible in your picture.
For what its worth it hasn't moved between your picture yesterday and this afternoon.

[Zepfancouver]

Originally Posted by madog222

I had a closer look today...

Cool! thanks for the follow up.
I drive through Mount Pleasant at least 3 times a week using Broadway or 1st, 21 years living DT and never used G N Way to go home. I will now, for more postings.

[Hooknose]

Why doesn't Translink have a "daily progress" web site?
Even a Saturday weekly update would be fun.
Something like
Tunnel A 2% complete
Tunnel B 0% complete
Main Street Box 15% complete

etc.

I am sure they have it for themselves.