Talk:London Underground 1996 Stock
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London Underground 1996 Stock was the selected article of the London Transport Portal between 18th September - 3rd October. |
The following comment was moved from the article: Although Wikipedia frowns upon comments within the article, I seem to be unable to edit the discussion page. I am reluctant to register due to my observations on unrelated pages containing potentially nationally security sensitive information. The correct information will be posted in the next day or two. —The preceding unsigned comment was added by 86.137.167.74 (talk • contribs).
- At the same time as this comment a {{disputed}} tag was added to the article. Although this comment does not give any indication of what is disputed, the edit summary said - "How anybody can assume that stock built in 1996 is older than stock built in 1995 escapes me". Thryduulf 11:32, 7 May 2006 (UTC)
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- The inacuracy lay over the modus operandi of the traction system. The revised material has been added. During research of some of the finer details, I stumbled across the copyrighted web site from which the original material had clearly been stolen - almost word for word. As no copyright acknowledgement was included, I believe that this violates wikipedia's stated copyright policy. The copied article had got it totally the wrong way round and completely missed the reason for the difference.
[edit] Traction control - 1995/1996 TS differences
I've just made a pretty major edit to this article, because the section on traction control made some elementary mistakes with reference to 1996/1995 tube stock (although it was strong on electrical engineering). It is a documented fact that 1996 TS uses a 3-phase AC drive controlled by a GTO thyristor, while 1995 TS uses a 3-phase AC drive controlled by an IGBT. See pages 15 and 13 of London Underground's official rolling stock spec guide - [1]. The previous edition of the article claimed that 1995 TS ran on DC with a GTO thyristor and 1996 TS ran on AC with an IGBT. This is not true (1992 TS on the central line is DC with a GTO thyristor).
I know it's confusing that 1996 TS is older in traction technology terms than 1995 TS, a situation that arose because the former's spec was frozen in 1991 (because it was commissioned for the JLE). But it's true, and this article needs to reflect the facts. 1996 TS, like the 465s/365s it shares a traction system with, makes the funny whiny noise because of the chopping action of the GTO thyristor. 1995 TS doesn't because the IGBT is smoother. Similarly, new AC mainline trains like Electrostars don't because they also use IGBTs.
BTW, I'm not a qualified electrical engineer, so if any of the explanation of traction systems is off then feel free to fix it - however, please keep the facts on the trains' actual spec correct!--Stalinism 12:26, 21 June 2006 (UTC)
