Talk:Great Northern, Piccadilly and Brompton Railway

Redirect
May be a good idea to add redirect to Piccadilly line at top of article, Tom B (talk) 00:31, 26 March 2009 (UTC)
 * I don't think a disambiguation link is really necessary as there is a link to Piccadilly line in the lead section and a link in the legacy section for the post 1933 history. --DavidCane (talk) 23:50, 26 March 2009 (UTC)

Depth
How deep were the "deep-level" tubes? 100 feet? 10 meters? The article doesn't say. Hires an editor (talk) 02:35, 15 December 2010 (UTC)
 * Still a good question. Is it in the article now?--DThomsen8 (talk) 00:35, 18 October 2013 (UTC)
 * In the context of London Underground, "deep level line" is a reference to the construction technique, rather to specific depth—the deep-level lines actually run above-ground for most of their lengths, and none are particularly deep by the standards of, say, Moscow. Deep-level lines (also known as tube lines) run in circular tunnels bored underground, as opposed the the cut-and-cover lines (also known as sub-surface lines) which run in rectangular trenches which were then covered over after construction, and as a consequence are only a short distance below the surface. The deepest point on the deep-level tube network is just north of Hampstead station, at 221 feet below ground, and the deepest point below sea level is Westminster at about 100 feet below sea level. See London Underground infrastructure for more explanation. 92.40.23.135 (talk) 00:52, 18 October 2013 (UTC)

Record holder
Excellent article! Well done! Something that might be worth noting is that for some time, the Piccadilly Line was considered (at least by some) to be the longest railway tunnel in the world. (I remember this from a children's quiz book from the late 1960s, which I might still have somewhere.) TheAMmollusc (talk) 06:32, 18 October 2013 (UTC)


 * You might be referring to the tunnel on the Northern line between East Finchley and Morden (via Bank), which is the longest railway tunnel in the UK at 17.3 miles. See https://en.wikipedia.org/wiki/Longest_railway_tunnel LowSelfEstidle (talk) 08:06, 18 October 2013 (UTC)

Conversion of distances
As this is a British topic, shouldn't distances be given in mi/km, rather than km/mi? Mjroots (talk) 08:34, 18 October 2013 (UTC)
 * Perhaps; but the whole of the London Underground was resurveyed in the early 1970s, with distances in kilometres from a zero point at Ongar. See also Wikipedia talk:WikiProject UK geography. -- Red rose64 (talk) 10:09, 18 October 2013 (UTC)
 * I note your comment there, but as this article deals with the period before the resurveying, I'd say it should be in mi/km and not km/mi. Mjroots (talk) 17:58, 18 October 2013 (UTC)
 * The reason I wrote the article using kilometres first is because that was the unit used in the sources. This, in turn, is because that is the official unit of measurement used by London Underground. The original bills before parliament usually described the distances in miles and chains.--DavidCane (talk) 21:18, 18 October 2013 (UTC)

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