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There is a tiny section of dual gauge on the Quay at Exeter, alongside the canal basin. It includes a 90 degree turn, with a pit with central mount for a turntable. I've assumed it is Brunel's Broad gauge and standard gauge, but not measured it. Midgley ( talk) 01:12, 10 December 2019 (UTC)
From the French Wiki Peter Horn User talk 13:29, 23 August 2020 (UTC)
Can someone give the actual name of the line? Peter Horn User talk 18:59, 3 November 2020 (UTC)
Error in picture - the 1435mm gauge is probably 1067mm gauge, as on Sakhalin Island. The difference between 1520 and 1435 is only 85mm which is actually very small. Label "1435mm" should be "1067mm". [1]
References
Hi, I understand that rail gauges must be a certain distance apart to allow a three-rail arrangement, while close gauges require four rails. However, what is the limit between the two? i.e. what is the minimum distance between gauges that allows for three rails? It's surprisingly difficult to look up this information. It seems to be somewhere around 6 inches or so, but I'm not sure. And is this different for narrow vs broad gauges? I read somewhere that 3 ft (914 mm) & 3 ft 6 in (1,067 mm) can fit on three rails, while ~5 ft (1,520 mm) and 5 ft 6 in (1,676 mm) cannot, despite them both being ~6 in apart. Is this correct, or off-base? More info would be appreciated. Xcalibur ( talk) 20:55, 19 October 2022 (UTC)
Under "Dual gauge (three rails)" I don't understand why, if the difference between gauges is small, a separate set of inner rails can be fit even though it's stated that isn't room physically to install just a single inner rail — which would be farther from the nearest outer rail than in the 4-rail construction. Casey ( talk) 17:37, 30 March 2023 (UTC)
I have undertaken a major re-write of the article, excluding the Dual gauge by nation section. First, because it had been littered for a long time with unreferenced text, much of it of limited value or poorly expressed, leaving an impression of lack of focus and disjointedness. (The Dual gauge by nation section has similar faults, but at 2500 words long with only four references, it's beyond my capacity to rectify.) The text I deleted included some with significant errors.
The article had 36 photos when Trainsandotherthings reduced them to 18 on 30 August, saying "This article already has MORE THAN ENOUGH photos." I fully agree with that remark. I looked through the remaining images and their captions, and concluded that the range of track configurations could still be improved by adding some new photos and deleting some of the remaining ones. The total now is 14 in three galleries plus three others. I may compile a small gallery for the Alternatives to dual-gauge track section.
I formatted the galleries without using "gallery" coding so that the photos would be accessible on mobile devices – hence making them only 2 images wide.
I saved display space by setting the following to "collapsed":
I replaced the very long Track gauge sidebar with a text box containing a link to the sidebar in the Gauge article, to avoid WP:STACKING and because it isn't of great importance in this (dual gauge) article. Similarly, I have taken the long list of countries out of the table of contents.
With the text, my aim was to demonstrate factually what forms of multiple gauges exist, why, what the main constraints are, and what the alternatives to dual-gauge track are. It was a huge challenge digging out references for these subjects, but I eventually achieved coverage, albeit to a large extent through Australian sources. This was because (a) I have / have access mainly to them, (b) the whole subject is sparsely covered in the literature to the technical depth required here. Anyone desiring wider-scope documentation is very welcome to add (referenced) text. ;-)
Feel free to discuss here, especially if you would like to find why I have made a particular decision. Cheers, Simon – SCHolar44 🇦🇺 💬 at 03:45, 8 November 2022 (UTC)