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Old May 11th, 2012, 12:35 AM   #641
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And some more new photos:

http://www.ibtimes.co.uk/articles/33...res-ceneri.htm
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Old May 12th, 2012, 08:53 PM   #642
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Thank you for the links!
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Old June 2nd, 2012, 02:27 PM   #643
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Amsteg worksite, 5 May 2012:

[IMG]http://i48.************/2h6g6yh.jpg[/IMG]

[IMG]http://i46.************/2625o9l.jpg[/IMG]
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Old June 26th, 2012, 11:41 PM   #644
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GBT construction site open day - 30 June

Is anyone from SSC planning to attend this at Erstfeld on Saturday? If so it would be great to see some new pics of the work.
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Old June 26th, 2012, 11:45 PM   #645
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I am...
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Old June 26th, 2012, 11:51 PM   #646
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Quote:
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I am...
Cool! I hope we can see some of your pics next week then Coccodrillo.
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Old July 2nd, 2012, 12:24 AM   #647
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Here they are!

All the works base is paved to avoid dust, except the switches which are in a box made to avoid dispersion of their lubricants.

[IMG]http://i48.************/2vb7amq.jpg[/IMG]

Firstly tubes, cables and various ducts are posed using these bidirectional road vehicles. Then track is laid with a single train which transport sleepers, rails, and can pour the concrete to fix them.

[IMG]http://i47.************/qrlmop.jpg[/IMG]

Another work train, probably to install smaller components (it's neither for track laying nor for overhead wires).

[IMG]http://i45.************/2pzxobb.jpg[/IMG]
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Old July 2nd, 2012, 12:25 AM   #648
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One wagon used to install overhead equipment. There are two towers (the other is not visible in the photo), and they can go higher. These vehicles can move alone along the track, but they are towed for longer distances.

[IMG]http://i47.************/2cghtky.jpg[/IMG]

In the background the beginning of the track laying train, which is several hundreds metres long. In the foreground a low floor 8-axle wagons like the ones used for combined transport used to carry road vehicles or other high equipment in the tunnel.

[IMG]http://i48.************/f4jxft.jpg[/IMG]

The underground cavern for the future branch tunnel to Arth Goldau. If built the underground section will be around 80 km long. This is the eastern tube, where around 8 km of track have been already laid from the north (much less, say around 1 km, in the other tube). On the other side of the tunnel, 50 km south, there are 13 km of track in the western tube (it's there where from autumn 2013 the first electric trains will be tested up to 230 km/h, not more at this stage of works because the track will not be enough long).

[IMG]http://i46.************/2mzbd5w.jpg[/IMG]
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Old July 2nd, 2012, 12:25 AM   #649
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Part of the switch has been installed, without the moving parts. This will enable the construction of the future branch without interrupting the rail traffic for too much time. This will not happen until 2040 at the earlies, however. There are many of these underground junctions in the AlpTransit project: 10 in the Gotthard base tunnel, 4 in the Ceneri base tunnel, 2 in the Zimmerberg base tunnel and 13 in the Lötschberg base tunnel: 29 in total (some of them without use now, but built to allow future branches).

[IMG]http://i45.************/2na7n8m.jpg[/IMG]

Looking north, we are about 7.5 km from the northern portal in the eastern tube. Note how wide is the tunnel, it could host a two-lane road. Boring diameter is around 9.5 m, that should be around 8.8 m subtracting the lining.

[IMG]http://i50.************/wunw2v.jpg[/IMG]

One of the two trains shuttling, composed by a locomotive and two coaches. They crossed just outside the tunnel as underground there are no crossing possibilities (for now).

[IMG]http://i49.************/xx549.jpg[/IMG]
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Old July 2nd, 2012, 12:26 AM   #650
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One of the many cross passages connecting the two tunnels (they are around 170 in total), this one is quite small but others are bigger as they were built to allow passage of road vehicles (however, the final tunnel will no more be usable by them).

[IMG]http://i49.************/302qtds.jpg[/IMG]

Where one of the two Amsteg access tunnels meets the western bore. A sort of tunnel has been built inside the tunnel for aerodynamic reasons. There are three access tunnels in total, two of them also host rescue stations (not this one).

[IMG]http://i50.************/2r2cikw.jpg[/IMG]

In one of the Amsteg access tunnels there is this short section of track and equipment. It was built for test purposes, but it has been transformed as an attraction for visitors with panels explaining how the tunnel is built. There is a similar installation also on one of the souther work site (that will be demolished in future - the one in the photo here is likely going to remain).

[IMG]http://i48.************/mwa51c.jpg[/IMG]
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Old July 2nd, 2012, 12:27 AM   #651
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After this test track we can still see the narrow gauge tracks (900 m, slightly less than 3 ft) used by works trains.

[IMG]http://i48.************/2dtr501.jpg[/IMG]

The two Amsteg access tunnels form an X: behind and in front of me there is the road access tunnel, around 2.7 km in length and wide enough for two lanes. On the left there is the cable tunnel (~2.5 km) of a smaller diameter which lead to the Amsteg hydroelectric power station, owned by the SBB and that directly feeds the tunnel. The road tunnel was built first by drill&blast, followed then by the cable tunnel built by a TBM this time starting from this cavern and going out to the surface.

[IMG]http://i49.************/2z5t1y0.jpg[/IMG]

Opposite the cable tunnel there is this cavern, with a building for various equipment. As I said before, it is no longer possible to enter the rail tunnels with road vehicles from there: only by foot.

[IMG]http://i48.************/2pphpfq.jpg[/IMG]

The west tunnel looking north, here still without tracks.

[IMG]http://i50.************/nbcaxd.jpg[/IMG]

We are back to the sunlight! If the second Gotthard road tunnel will not be built, this place will be reused for temporary truck shuttle trains during the refurbishment of the first road tunnel. In any case, in the end fields will come back.

[IMG]http://i49.************/30vj5e0.jpg[/IMG]

An aerial photo: the tunnel is to the south, on the left the Gotthard mainline, on the right a industrial siding no more in place.

[IMG]http://i46.************/2aezdah.jpg[/IMG]
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Old July 2nd, 2012, 03:05 AM   #652
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Amazing pictures. Thanks Coccodrillo!
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Old July 2nd, 2012, 08:42 AM   #653
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Quote:
Originally Posted by Coccodrillo View Post
Part of the switch has been installed, without the moving parts. This will enable the construction of the future branch without interrupting the rail traffic for too much time. This will not happen until 2040 at the earlies, however. There are many of these underground junctions in the AlpTransit project: 10 in the Gotthard base tunnel, 4 in the Ceneri base tunnel, 2 in the Zimmerberg base tunnel and 13 in the Lötschberg base tunnel: 29 in total (some of them without use now, but built to allow future branches).
Are there going to be any crossovers in the Gotthard tunnel?
Also, are there really 13 junctions prepared in the Lötschberg tunnel? For what future extensions?
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Old July 2nd, 2012, 10:21 AM   #654
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You are welcome

Quote:
Originally Posted by Coccodrillo View Post
The two Amsteg access tunnels form an X: behind and in front of me there is the road access tunnel, around 2.7 km in length and wide enough for two lanes. On the left there is the cable tunnel (~2.5 km) of a smaller diameter which lead to the Amsteg hydroelectric power station, owned by the SBB and that directly feeds the tunnel. The road tunnel was built first by drill&blast, followed then by the cable tunnel built by a TBM this time starting from this cavern and going out to the surface.
A note about that. SBB decided to electrify its lines with an AC system in the 1910s, preferring it over the DC systems. As high frequency motors were difficult to build at that time it was not possible to use the 45 to 50 Hz of the (quit basic anyway) industrial network of the time. It was then decided to use one third of this frequency, 16 and 2/3 Hz, building a separate electric network with its own power lines, its own power stations, etc. In this way 80% of the electricity used by SBB is hydroelectric (mainly from its owns power stations), and nearly all of its trains run on electric power (the exceptions are industrial sidings, a few freight only branch lines, and maintenance trains). The 16 and 2/3 Hz (now 16.7 Hz) and 50 Hz network are basically isolated from each other.

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Are there going to be any crossovers in the Gotthard tunnel?
Yes, two, at one third and at two thirds of the tunnel, and also just outside the tunnel. That's one every around 20 km (on the rest of the Gotthard railway they are every 3 to 5 km).

There are two double crossovers in the Lötschberg base tunnel irregularly spaced and two single ones (one way). From the northern portal: km 1 single (track 2 Frutigen station, see below), km 8 double, km 22 double, km 29 single (Steg branch). I'm not sure about the exact position of the crossovers, but these distances are more or less correct.

The Zimmerberg base tunnel has a crossover near the northern portal (but it is a single tube double track tunnel, so there are no such caverns), the Ceneri base tunnel doesn't have crossovers at all (the 4 caverns are for branches).

Quote:
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Also, are there really 13 junctions prepared in the Lötschberg tunnel? For what future extensions?
Yes. 8 are for crossovers in Mitholz and Ferden (4 caverns each), 3 are for the Steg junction (bored but without tracks, for trains Bern-Frutigen-Sion), and 2 are near the northern portal to link track 2 of Frutigen station with the eastern tube. Only 2 of these 13 are actually used, the others have only one track laid (no switches, or with an incomplete switch like the one in my photo) or are completely without tracks.

You can see 11 of them there: http://schienenfahrzeuge.netshadow.a...96be1f08b514ae (there is another est-west tube link near Mitholz)
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Old July 2nd, 2012, 03:02 PM   #655
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Thanks. I learn something every day. I wish I could have made it to the open day...
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Old July 3rd, 2012, 10:14 AM   #656
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Maybe if you will be able, on 29th September: http://www.alptransit.ch/en/visit-us...-open-day.html (about the boring techniques - no tracks there at this stage)
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Old July 4th, 2012, 10:19 PM   #657
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Thanks for the many pics Coccodrillo
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Old July 5th, 2012, 05:23 AM   #658
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is it true the sedrum shaft is 800m height?
what are there inside the shaft? only stairs? should it have elevators?
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Old July 5th, 2012, 07:57 AM   #659
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people
is it true the sedrum shaft is 800m height?
what are there inside the shaft? only stairs? should it have elevators?
It is. and here is a service elevator in it.
And there is this plan to actually build a railway station there, "Porta Alpina". If built this would have one of the longest elevators in the world.
Currently however this project is on hold. However as far as I know it has been decided not to do anything that would make it impossible in the future.
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Old July 5th, 2012, 09:58 AM   #660
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There are two shafts in Sedrun, each 830 m high. One will have a small elevator for workers, the other will only be used for ventilation. However it is likely that, in addition to the elevator, there are cranes in both to allow maintenance of any point of the shafts.

Porta Alpina would be of difficult access as both at track level and between the top of the shaft and the outside there are long distance that would have to be covered by bus (around 1.5 km/1 mile each).

The top of the shafts are inside a mountain, from there there is a road tunnel (around 1 km long) that goes to Sedrun village and an inclined shaft going in the opposite direction. this shaft is used for ventilation and ends in an inhabited valley on the opposite side of the mountain (in respect to Sedrun).
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