{"id":78500,"date":"2022-07-20T17:12:46","date_gmt":"2022-07-20T15:12:46","guid":{"rendered":"https:\/\/ivmtech.it\/?page_id=78500"},"modified":"2022-10-24T13:15:39","modified_gmt":"2022-10-24T11:15:39","slug":"indagini-deragliamento","status":"publish","type":"page","link":"https:\/\/ivmtech.it\/en\/pillole-tecniche\/indagini-deragliamento\/","title":{"rendered":"Post derailment investigations"},"content":{"rendered":"<p>[vc_row][vc_column][vc_text_separator title=&#8221;The importance of measuring the distribution of vertical forces per wheel in static conditions for maintenance&#8221; color=&#8221;custom&#8221; border_width=&#8221;2&#8243; accent_color=&#8221;#ffd200&#8243; el_class=&#8221;sticky&#8221;][vc_empty_space height=&#8221;20px&#8221;][vc_column_text css_animation=&#8221;left-to-right&#8221;]<span style=\"font-weight: 400;\">The correlation between derailment of a rolling stock and an uneven distribution of vertical wheel forces is addressed in multiple post-derailment investigations carried out in different areas. Japan, Australia, India, America and the United Kingdom are just some of the many countries that have identified load wheel imbalance as the main cause, or contributing factor, of accidents during post-derailment investigations. Some of the investigations are available at the following links:<\/span><\/p>\n<p><strong>Japan:<\/strong><\/p>\n<p><a href=\"https:\/\/www.mlit.go.jp\/jtsb\/eng-rail_report\/English\/RA2014-5-2e.pdf\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Railway accident investigation report in Mojiko station<\/span><\/a><\/p>\n<p><a href=\"https:\/\/www.jstage.jst.go.jp\/article\/jmtl\/3\/1\/3_1_2\/_pdf\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Progress of Safety in Japanese Railways &#8211; Accidents investigations,Countermeasures and R&amp;D of Safety Technologies<\/span><\/a><\/p>\n<p><strong>Australia:<\/strong><\/p>\n<p><a href=\"https:\/\/view.officeapps.live.com\/op\/view.aspx?src=https%3A%2F%2Ftransportsafety.vic.gov.au%2F__data%2Fassets%2Fword_doc%2F0018%2F402642%2FRail-Safety-News-Issue-8.docx&amp;wdOrigin=BROWSELINK\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Rail Safety News<\/span><\/a><\/p>\n<p><strong>India:<\/strong><\/p>\n<p><a href=\"https:\/\/www.iricen.gov.in\/iricen\/books_jquery\/investigations_of_derailments_2015.pdf\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">The Investigation of Derailments<\/span><\/a><\/p>\n<p><strong>United States:<\/strong><\/p>\n<p><a href=\"https:\/\/www.federalregister.gov\/documents\/2013\/03\/14\/2013-06000\/safety-advisory-2013-02-low-speed-wheel-climb-derailments-of-passenger-equipment-with-stiff\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Safety Advisory 2013-02: Low-Speed, Wheel-Climb Derailments<\/span><\/a><\/p>\n<p><strong>United Kingdom:<\/strong><\/p>\n<p><a href=\"https:\/\/www.gov.uk\/government\/news\/raib-report-072020-freight-train-derailment-at-willesden-high-level-junction\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">RAIB report 07\/2020: Freight train derailment at Willesden High Level Junction<\/span><\/a><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">For example, the latest investigation above mentioned took place in the UK. The accident involved a freight wagon which was running on a junction expected on the route. However, one of its empty two-axle wagons derailed.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The <strong>RAIB<\/strong> (Rail Accident Investigation Branch) investigation revealed the combination of the following two factors as the cause of derailment:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A considerable twisted track<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Load on the left front wheel not enough to prevent a derailment\u00a0<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Later, the second factor has been verified: it was the direct consequence of a significant load imbalance between the wheels on the two diagonals of the axle wagon. <\/span><span style=\"font-weight: 400;\">As a result, <\/span><span style=\"font-weight: 400;\">the set-up<\/span><span style=\"font-weight: 400;\"> of the wagon did not allow the vehicle to adapt to such a strong and abrupt twisted track while running.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To learn more about how the homogeneous load distribution makes a general railway vehicle capable of adapting to a twisted track, see the topic &#8220;Wheel load distribution&#8221;.<\/span>[\/vc_column_text][\/vc_column][\/vc_row]<\/p>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_text_separator title=&#8221;The importance of measuring the distribution of vertical forces per wheel in static conditions for maintenance&#8221; 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