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Well, actually the 1524mm gauge was chosen because it is exactly 5' 0" between the rails. And the SA3 coupler is a development of the Willison type, with the same general idea of a fixed head with internal locks to stop two couplers from coming apart, although (from photographs I have seen) the Willison generally has a much simpler internal mechanism that operates around a vertical axis, whereas the SA2 and later SA3 type couplers have a more complicated locking system that operates around a horizontal axis.
SA-3 coupler is an essentially differs from Janney coupler. These are absolutely different development.
Janney coupler: The traction effort is transferred from one coupler to another coupler through rotary details.
SA-3 coupler: The traction effort is transferred directly from the body of one coupler to the body of another coupler.
P.S. Sorry for my bad English
Dmitry Sutyagin --
195.112.127.162 16:03, 23 October 2007 (UTC)
The couplings must hold at least 9000 ton: With a weight up to 8600 ton, and a maximum gradient of 10 permille, the iron ore trains of Malmbanan don't snap. Ssteinberger ( talk) 20:48, 18 April 2008 (UTC)
Since Soviet railways seem to be happy to run trains of "only" 6,000 tonnes and say 800m in length, the absolute maximum capability of the SA3 coupling has never been determined. However, the heaviest trains of 30,000T and longest trains of 2,500m use the AAR couplings. Tabletop ( talk) 02:51, 3 August 2008 (UTC)
According to coupling (railway) by country, Iraq uses SA3 couplers. However since the preferred coupling for the UAR in Africa and perhaps the middle east as well is the AAR, perhaps Iraq will eventually convert to this as well for the sake of standardisation. Tabletop ( talk) 02:57, 3 August 2008 (UTC)
Can someone translate the caption in English? Peter Horn User talk 21:39, 20 March 2010 (UTC)
This article contradicts Ofoten Line#History, Iore#History, and Iron Ore Line#Heavier trains.
All three articles claim that SA3 couplers are no longer used, and Janney/AAR are used instead since about 2004. Teaktl17 ( talk) 06:36, 12 December 2011 (UTC) But probably all three articles are wrong; they all refer to the same document, and the document doesn't support AAR use. Also, these 3 articles state the K. Industrier wagons are used, but Kockums Industrier clearly state that SA-3 coupler is used on Iron Ore Line: http://www.kockumsindustrier.se/en-us/our-products/productdetail/?categoryid=5&productid=9 (wagon name is Fammoorr050) Teaktl17 ( talk) 08:08, 12 December 2011 (UTC)
Could the author try to add an article about inventor John Willison from Derby, England, just as there is an article about Eli Janney? — Preceding unsigned comment added by 204.74.208.18 ( talk) 12:55, 5 November 2016 (UTC)
Patent US1194109 A and Patent US1194110 A show Janney coupler compatibles. Just click on the links and look at the patent illustrations. Peter Horn User talk 14:28, 18 August 2017 (UTC)
![]() | This article is rated Start-class on Wikipedia's
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Well, actually the 1524mm gauge was chosen because it is exactly 5' 0" between the rails. And the SA3 coupler is a development of the Willison type, with the same general idea of a fixed head with internal locks to stop two couplers from coming apart, although (from photographs I have seen) the Willison generally has a much simpler internal mechanism that operates around a vertical axis, whereas the SA2 and later SA3 type couplers have a more complicated locking system that operates around a horizontal axis.
SA-3 coupler is an essentially differs from Janney coupler. These are absolutely different development.
Janney coupler: The traction effort is transferred from one coupler to another coupler through rotary details.
SA-3 coupler: The traction effort is transferred directly from the body of one coupler to the body of another coupler.
P.S. Sorry for my bad English
Dmitry Sutyagin --
195.112.127.162 16:03, 23 October 2007 (UTC)
The couplings must hold at least 9000 ton: With a weight up to 8600 ton, and a maximum gradient of 10 permille, the iron ore trains of Malmbanan don't snap. Ssteinberger ( talk) 20:48, 18 April 2008 (UTC)
Since Soviet railways seem to be happy to run trains of "only" 6,000 tonnes and say 800m in length, the absolute maximum capability of the SA3 coupling has never been determined. However, the heaviest trains of 30,000T and longest trains of 2,500m use the AAR couplings. Tabletop ( talk) 02:51, 3 August 2008 (UTC)
According to coupling (railway) by country, Iraq uses SA3 couplers. However since the preferred coupling for the UAR in Africa and perhaps the middle east as well is the AAR, perhaps Iraq will eventually convert to this as well for the sake of standardisation. Tabletop ( talk) 02:57, 3 August 2008 (UTC)
Can someone translate the caption in English? Peter Horn User talk 21:39, 20 March 2010 (UTC)
This article contradicts Ofoten Line#History, Iore#History, and Iron Ore Line#Heavier trains.
All three articles claim that SA3 couplers are no longer used, and Janney/AAR are used instead since about 2004. Teaktl17 ( talk) 06:36, 12 December 2011 (UTC) But probably all three articles are wrong; they all refer to the same document, and the document doesn't support AAR use. Also, these 3 articles state the K. Industrier wagons are used, but Kockums Industrier clearly state that SA-3 coupler is used on Iron Ore Line: http://www.kockumsindustrier.se/en-us/our-products/productdetail/?categoryid=5&productid=9 (wagon name is Fammoorr050) Teaktl17 ( talk) 08:08, 12 December 2011 (UTC)
Could the author try to add an article about inventor John Willison from Derby, England, just as there is an article about Eli Janney? — Preceding unsigned comment added by 204.74.208.18 ( talk) 12:55, 5 November 2016 (UTC)
Patent US1194109 A and Patent US1194110 A show Janney coupler compatibles. Just click on the links and look at the patent illustrations. Peter Horn User talk 14:28, 18 August 2017 (UTC)