Talk:List of longest tunnels

message: How about a table listening tunnels by their maximum rock coverage?
Like this: http://www.japan-tunnel.org/nttj/statistical_data/index2.html
Coccodrillo 18:59, 24 October 2007 (UTC)
thread_title: List of tunnel by depth

message: Metro tunnels should be excluded from the main table, in my opinion. They could stay in the separate table, if you like. Metro tunnel as I said are always near the surface and made by several shorter tunnels. There are hundreds of subways, it's useless to add the lenght of all their tunnels. Maybe some particular tunnels could be added (the BART tunnel under the Bay in San Francisco, as example). Coccodrillo 08:18, 1 December 2006 (UTC)
thread_title: Metro tunnels

message: The CERN tunnel is one example. Another is the networks of tunnels in places where they were used for warfare or as escape routes. Would those be included in such a listing??
----
I think the middle table, named "Vehicular" should be skipped. The bottom table ("Top 100") covers those tunnels anyway. Tables of other kinds of tunnels could be a good addition.--Blue Elf 20:26, 8 December 2005 (UTC)
replies: text: If someone wants to include other types of tunnels (industrial/mine/others not for public) then try to find some info and go ahead. Minimum requirement: walkable. Some war escape/hiding tunnels are so narrow that they are crawlable, not walkable. I have added some metro railway tunnels, noone else has. - BIL 14:34, 6 November 2006 (UTC)
thread_title:  Other types of tunnels 

message: According to my sources (Stamps.fo and the Danish travel guide Turen går til Færøerne of 2005), the tunnel is on 6,300 m and thus some places more in top of the ranking. Where is the 6,100 m in the article from? -- Arne List 19:54, 3 May 2006 (UTC)
thread_title: [[Norðoyatunnilin]] (Faroe Islands)

message: Why are subways excluded from this?  It seems entirely arbitrary, and excludes some very long tunnels.  At the very least, it needs it's own category.  Until relatively recently, the Morden to East Finchley section of the London Underground's Northern Line was the world's longest tunnel.
:: It is hard to define what a tunnel is: some underground tunnels are very long, but just under the surface. It is harder (normally) to build 20 km of tunnel under 2000 m of mountains than 100 km of subway tunnel, under 50 m of rocks (build it without causing damages to the buildings on the surface, that is another matter). I think subway tunnels should not be included (often, there are more short tunnels linked one to another). Coccodrillo 17:36, 15 November 2006 (UTC)
replies: text:  Be honest, you just want to exclude cut-and-cover. And that's fine. As for the mountains-only idea, the Marmaray underwater tunnel is most interesting and is of decent length. 24.200.248.28 05:25, 17 January 2007 (UTC)
replies: text:  Marmaray in my opinion can be included, because is not a subway... Coccodrillo 18:26, 10 February 2007 (UTC)

text: While I agree that many proposed tunnels will not be built und thus cause a bloated listing, I think that tunnels well under construction should be mentioned. Maybe not in the main table but then in an additional list.--Klaus with K 09:37, 2 June 2006 (UTC)

text: I added two long Subway/Metro/Underground/Rapid tranist (whichever it is called) tunnels as you suggested. It is hard to find info about such tunnels. /BIL 23:35, 3 June 2006 (UTC)
replies: text: I can add the fact that they were completely removed from the German version of this article, since the stations could not be called tunnels, in their eyes. The Subway tunnels have more passengers than any other tunnel, but still there is hard to find info about them. I have measured some with detailed maps and Google Earth. -- BIL 22:32, 17 January 2007 (UTC)
replies: text: Subways are usually made of several sub-surface tunnels, sometimes built underground, sometimes by cut&cover. I think that these tunnels should not added to this article at all, simply because...there are hundreds of subway lines in the world, each dozens km long, with several other service tunnels. I think a table with the length of hundreds of subways lines is of no interest. Maybe a page about building tunnels in an urban environment, with some exemples, could be more interesting. Coccodrillo 18:26, 10 February 2007 (UTC)
thread_title: Railway tunnels (excluding subways)

message: This tunnel has two (already existing) approaches on the north; measured by the longer Innsbruck bypass approach it will be 62,700 m, thus passing Gotthard. [BBT technical data (in German)]
Gotthard, for its part, has an extension under consideration (the Axentunnel, which would increse its overall length to some 75,000 m. As this is only under consideration, it is too early to include in the table.
Aldenrw (talk) 19:06, 6 October 2010 (UTC)
thread_title: Brenner

message: Here is a proposal on how to structure the tunnel lists.
:List of tunnels would be a central navigational page, leading to:
::List of tunnels by length, purely based on length, not type
::List of tunnels by type, with sections for rail and road etc (much like this current page)
::List of tunnels by location, sorted into countries
We would have a navigation template at the top of each article, linking to the others.
:Disadvantage of List of tunnels being rather empty, and a new tunnel needs to be mentioned on three pages. But I think these are minor objections.--Klaus with K 09:37, 2 June 2006 (UTC)
replies: text: P.S. The German longest-tunnel-page :de:Liste der längsten Tunnel der Erde looks well-structured to me.--Klaus with K 09:50, 2 June 2006 (UTC)

text: Distances should be metric, I slightly prefer metres over kilometres. As for the imperial measurement, the really real proper way is to use miles and chains.--Klaus with K 09:37, 2 June 2006 (UTC)
replies: text: Distances should be metric first. If no one objects, I will switch soon.--Jusjih 05:51, 22 June 2006 (UTC)
replies: text: No objection, only suggenstions... Length in metres (miles) ... merge the tables and add a small width column (Rail, Road, Metro, Water, Canal...) ... what do you think about comments like on the German page? If you think they make sense I could be convinced to write/translate them.--Klaus with K 16:50, 22 June 2006 (UTC)
replies: text: I cannot read German, so if you wish, please translate.--Jusjih 01:59, 23 June 2006 (UTC)
replies: text: These comments read like 'longest rail tunnel' 'longest road tunnel' 'longest underwater distance' 'longest land-based tunnel' and so on. If you add a comment column, I could add some contents when I find time (it is not that much).--Klaus with K 14:49, 23 June 2006 (UTC)
thread_title:  New organisation idea 

message: How come that we right now can have one (but only the longest) water supply tunnel, when we can't have metro tunnels. --BIL (talk) 16:12, 12 November 2008 (UTC)
replies: text: We (collectively and consensually, as editors) can probably agree to put anything we want as the title/introduction, and to fill in the data to reflect that it says on the tin.  IIRC, the article did previously state: "Often [metro tunnels] are not considered continuous because the stations do not count as tunnels" (but that was removed...).  This sentence least provided an explanation as to why (arbitrarily) metro tunnels had been excluded.  Depending on your point of view, it would probably be sensible to either add the longer metro lines (if the information can be sourced), or to restore the note covering their transfer to a separate listing.  —Sladen (talk) 12:44, 26 February 2009 (UTC)
thread_title: 2009

message: Name               	Location                         	metres (miles)	Type   	Year	Comment
Seikan Tunnel      	Tsugaru Strait, Japan            	53,850 (33.5) 	Railway	1988	longest tunnel
Channel Tunnel     	English Channel, England - France	49,940 (31.1) 	Railway	1994	
Hakkoda Tunnel	Hakkoda Mountains, Japan         	25,810 (16.5) 	Railway	2010	longest land tunnel
Lærdal             	Laerdal - Aurland, Norway        	24,510 (15.2) 	Road   	2000	longest road tunnel
St. Gotthard       	Alps, Switzerland                	16,918 (10.2) 	Road   	1980	
I tentatively shortened the Length in metres (miles) and the 
Year Completed in an attempt to have less empty space in the table. For now I do not have line breaks inside the table cells.--Klaus with K 13:58, 3 July 2006 (UTC)
thread_title:  Suggestion for the merged tables 

message: I have started to merge the tables, so far railway and road included. Metre values mostly taken from http://home.no.net/lotsberg/data/rail.html and http://home.no.net/lotsberg/data/tun10.html as the old metric values were rounded, some even having suffered metric->imperial->metric conversion.  Some metre values look to me like still rounded to the nearest 10m or 100m. Table cutoff a function of my available time today, see notes inside the tables.--Klaus with K 20:29, 7 July 2006 (UTC)
replies: text: I see the necessity to keep the column entries short, the table tends to get quite wide (and the year ranges for the tube tunnels do not help either but I do no know how to avoid it in these cases of staged construction). Short: no multiple mentioning as in Railway/Railroad or Metro/Subway/Tube/Underground, even the single Railroad is slightly on the long side. Distinctive: avoid similarities like Road vs Railroad, Railway vs Subway.--Klaus with K 21:35, 10 July 2006 (UTC)
thread_title:  Merged tables started 

message: As new tunnels are being built and completed, each single new entry added to a table would require the change of all subsequent rank numbers which is a maintenance pain. Hence no ordinal numbers please.--Klaus with K 10:46, 1 August 2006 (UTC)
replies: text: According to Road tunnels under construction there are 8 road tunnels to open in the next 4 years. Who is going to edit all these rank numbers in Vehicular each time?--Klaus with K 11:07, 10 August 2006 (UTC)
replies: text: And I planned to merge some of the double-tube tunnels into one, some are considered different tunnels. I planned to rank only top ten, now I have to remove the numbers. /BIL 12:22, 10 August 2006 (UTC)
thread_title:  No Rank numbers please 

message: The Seikan Tunnel hosts two cape gauge (1067 mm) tracks, so it is useless to write "longest metre-gauge tunnel" about the Vereina.
I'm trying to write dedicated pages for some tunnel, such as the Vereina Tunnel. Someone should correct my English. Coccodrillo 13:38, 29 November 2006 (UTC)
replies: text:  The Simplon Tunnel should be considered as only one thing. It's true that they were opened 15 years apart, but it's common to open the second tube of any tunnel only when the traffic requires it. Coccodrillo 17:43, 29 November 2006 (UTC)
thread_title: Seikan

message: Tagged since over a year, I have a bold moment and shall tidy up this page. Noting that people have invested work into the non-merged sections, I'll move this content to a page to be named List of further tunnels by length and leave it to others if they feel this leftover sections should be reorganised differently.--Klaus with K 16:43, 24 May 2007 (UTC)
thread_title:  List of further tunnels by length 

message: I don't think this needs to be in metres.  There is no need for 5 figure accuracy here.  An extra decimal can be added in order to seperate an tunnels that are close in length.
Agree/Dissagree?Shniken1 02:18, 27 September 2007 (UTC)
thread_title:  Metres --> Kilometres? 

message: This tunnel is at planning stage. Some intermediate access on the french side have ben built, but nothing on the italian side and it is not sure that the main tunnel will be built. There have been seveal announces, but nothing has been done untill today. Coccodrillo (talk) 22:19, 5 February 2008 (UTC)
thread_title:  Mont d'Ambin Base Tunnel 

message: As it's performing an alphabetic sort instead of numeric. I've read Help:Sorting and thought hidden keys must be the way to go but can't get it to work. Any wiki gurus in the house able to shed light on how to fix this up? Oosh (talk) 06:18, 4 January 2010 (UTC)
thread_title:  Sorting by Length is broken 

message: The Brenner Base Tunnel will connect underground with the existing Innsbruck bypass Tunnel, for a total length of 62.7 km.
Thus, the total length will exceed that of the Gotthard Base Tunnel by over 5km.
Seems obvious to me. Comments?
Brenner Base Tunnel project page
Aldenrw (talk) 21:31, 19 February 2010 (UTC)
replies: text: I think that if it is chosen 62.7 as length then the name in the table should be changed in "Brenner Base+Innsbruck Bypass" or similar with a note explaining that there are two linked tunnels, with a different history and structure (two single track tubes the Brenner, one double track tube the bypass). Another similar case will touch the Gotthard Base Tunnel if and when the proposed Axen tunnel is connected directly with it. The GBT has yet two underground caverns for that. Coccodrillo (talk) 20:24, 27 February 2010 (UTC)
thread_title:  Brenner 

message: WP calls for the use of templates such as cite web, cite book, etc. These raw web sites are practically useless. Also, this IS the English WP. I realize we are writing about an international topic, but in English. Sometimes there is no other recourse than to use sites in the original language. These are, as I say, useless to most English speakers. This is one of the drawbacks to being a speaker of a dominant language. Most Europeans speak at least another, but you don't realize English is in most cases our only language. I've heard the academics rail about this ignorance all my life and yet it is just as true today as it was in 1980 (sure, Dave. 1950?). To us, Reykjavik is still rinkey-dink. I recast the first ref to show you what might be done with Internet resources. If you could manage something like it for the rest of the gobbledeygook I am sure most native English speakers would appreciate that greatly, as this is quite an interesting article. As for the non-Roman alphabets - forget it, I am sorry to say. Try to get something in English.Dave (talk) 10:48, 27 February 2010 (UTC)
thread_title: The refs, the refs

message: The final break through in the east tube occurred on 15 October 2010. The break through in the west tube isn't expected until April 2011.
People keep adding this tunnel to the list of tunnels in use. It may not be completed until 2017 so is not in use.
StuZealand (talk) 21:22, 15 October 2010 (UTC)
thread_title:  Gotthard Base Tunnel incorrectly added to the longest tunnels in use 

message: The Kárahnjúkar hydroelectric plant in Iceland involves a tunnel network with 72 kilometers of tunnels combined, however the longest distance from one opening to another is 39.7 kilometers. Here is a description, here is an overview of all the tunnels and here is a map where the tunnels are marked with blue lines. Which number should be used in the list? --85.220.101.221 (talk) 18:12, 16 October 2010 (UTC)
thread_title:  Kárahnjúkar 

message: Adept for new record --W.Rebel (talk) 22:42, 16 November 2010 (UTC)
thread_title:  Gotthard Base Tunnel 

message: When the top table, World's longest tunnels (in use), first loads with the page it is ordered by length from longest to shortest. Well and fine. If you click to reverse the length order, it appears to be fine. But if you click again to return to longest>shortest the top 2 entries (Delaware Aquaduct and Päijänne Water Tunnel) disappear. Refreshing the page returns to proper state. ◦◦derekbd◦◦my talk◦◦ 03:43, 9 July 2011 (UTC)
replies: text: Noticed this as well. The 'UNK proton accelerator' of ~21,000 m, also behaved incorrectly because of a misplaced ~. This I corrected but what the other two problems could be, I am at a loss. The code for these looks perfectly fine.. AlwaysUnite (talk) 20:45, 7 August 2013 (UTC)
thread_title:  something is amiss 

message: I'm unsure as to the requirements for inclusion but should this list possible include (still functioning) qanats? The Wardak Qanat with 8m seems to qualify, as does the Turpan water system which seems to include qanats up to 10km long (the German wiki has a source for that). The Gadara qanat was an impressive 94km but probably doesn't qualify as it's no longer operational. Akerbeltz (talk) 23:01, 13 August 2013 (UTC)
replies: text: The list now seems to be limited to tunnels longer than 14 km. So that leaves only the Gadara qanat: I've tentatively created a new section for it: 'abandoned tunnels.' Let's see what happens. Uanfala (talk) 00:10, 28 September 2015 (UTC)
thread_title:  Qanats 

message: Thirlmere Aqueduct is not continuous (see :File:Thirlmere Aqueduct Higher Wheelton.jpg or ) and it is more likely pipeline than tunnel. I think it should be excluded from this list. --Jklamo (talk) 17:48, 17 November 2013 (UTC)
thread_title:  Thirlmere Aqueduct 

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thread_title:  External links modified 

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thread_title:  External links modified 

message: Is the Seikan Tunnel still the "Longest railway tunnel excluding urban metro lines with intermediate stations" now that the Gotthard Base Tunnel has been completed?  — Preceding unsigned comment added by Scotteaton92 (talk • contribs) 14:53, 1 June 2016 (UTC)
replies: text: In conventional English notation, "29,900 m" is twenty-nine thousand nine hundred metres, not twenty-nine point nine metres. So "29,900 m (18.6 mi)" is correct. I see from your home page that you're from Holland where (I'm guessing) "29,900 m" would be read as twenty-nine point nine metres. -- Hux (talk) 20:35, 12 October 2021 (UTC)
thread_title:  Seikan Tunnel still longest railway tunnel? 

message: Of all tunnels the lengths are expressed as a number with 1...3 digits before the decimal. Probably kilometers are stated. 29,900 m (18.6 mi) should obviously be  29,900 km (18.6 mi). One mile is 1609m not 1.609m.
It is probably a bug in the convert script : \{\{convert|57091|m|mi|1|abbr=on}} which introduces a decimal point in the meter value. It should evaluate 57091m and not 57.091m.
S k a t e b i k e r (talk) 18:35, 1 June 2016 (UTC)
replies: text: In conventional English notation, "29,900 m" is twenty-nine thousand nine hundred metres, not twenty-nine point nine metres. So "29,900 m (18.6 mi)" is correct. I see from your home page that you're from Holland where (I'm guessing) "29,900 m" would be read as twenty-nine point nine metres. -- Hux (talk) 20:35, 12 October 2021 (UTC)
thread_title:  Lengths are probably kilometers, not meters 

message: An IP added this to the Channel Tunnel: "Second longest railway tunnel until Gotthard tunnel was opened." This is true, but not really notable. We do not list "second anything" in general, unless there is a particular reason. The IP's edit comment claimed to be reverting me -- so I assumed I had made a mistake -- but in fact the version I removed was a claim to be the longest. Just for the record. Imaginatorium (talk) 07:18, 8 June 2016 (UTC)
replies: text:  No harm in listing "second" especially since it was also the longest in the Western world, not just in England. This is also been the 2nd longest for about 20 years.  — Preceding unsigned comment added by 101.178.163.8 (talk) 01:53, 9 June 2016 (UTC)
thread_title:  "Second longest..." 

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thread_title:  External links modified 

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thread_title:  External links modified 

message: Guangzhou Metro Line 3, at 57930 m, is listed as the "longest metro/rapid transit tunnel". Immediately below that, the Gotthard Base Tunnel, at 57104 m, is described as "...also the world's longest transit tunnel." Those statements can't both be true, can they? Or am I missing something? -- Hux (talk) 20:31, 12 October 2021 (UTC)
replies: text: Just coincidentally cleared up the confusion of this before seeing your post! It's longest by geodetic distance which I've made more clear FlyingScotsman72 (talk) 06:05, 6 July 2023 (UTC)
thread_title:  Is this a contradiction? 

message: It isn't clear to me what this is supposed to mean. For instance, the Taiwan Strait Tunnel Project is currently a member of this list, but the article states "The project is not considered viable due to a lack of interest from the Taiwanese, staggering costs and unsolved technical problems". I would have interpreted "advanced planning stage" as a project that is, at the very least, expected to obtain approval in the foreseeable future.  Scleractinian (talk) 05:55, 12 August 2022 (UTC)
replies: text: Feel free to clean-up that section. In fact, several of the tunnels on the list are not actually at an advanced planning stage.--Jklamo (talk) 09:15, 12 August 2022 (UTC)
thread_title:  How is "advanced planning stage" being defined?