{"id":32008,"date":"2019-09-02T06:13:14","date_gmt":"2019-09-02T06:13:14","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=32008"},"modified":"2019-09-02T06:13:14","modified_gmt":"2019-09-02T06:13:14","slug":"loch-eilt-1","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2019\/09\/02\/loch-eilt-1\/","title":{"rendered":"The landslide-induced train derailment at Lock Eilt in Scotland in January 2018"},"content":{"rendered":"

The landslide-induced train derailment at Lock Eilt in Scotland in January 2018<\/h4>\n

On 22nd January 2018 a train was derailed by a landslide at Loch Eilt<\/a> in north-west Scotland<\/a>, fortunately with no loss of life. \u00a0 The image below shows the aftermath of the event:-<\/p>\n

\"The

The aftermath of the train derailment at Loch Eilt in Scotland on 22nd January 2018. Image from the RAIB report into the incident<\/a>.<\/p><\/div>\n

.<\/p>\n

A few months later the Rail Accident Investigation Branch<\/a> published a report, available online, into the accident<\/a>.\u00a0 The report is well-written, providing a very clear narrative about the events on the day.\u00a0 It found that the landslide occurred as a result of rapid thaw after a period of cold weather, which in turn followed a phase of wet weather.\u00a0 Thus, the ground was saturated and frozen, with some snow cover.\u00a0 The increase in temperatures released substantial amounts of water, triggering the landslide.<\/p>\n

Of particular interest is the presence of the catch fence, which was overrun by the landslide debris, as shown in the image below, also from the RAIB report<\/a>:-<\/p>\n

\"Loch

The damaged catch fence at Loch Eilt in Scotland on 22nd January 2018. Image from the RAIB report into the incident<\/a>.<\/p><\/div>\n

.<\/p>\n

The UK has a byzantine structure for running the railways, with the track being managed by a not for profit, government-owned entity called Network Rail<\/a>, which is separate from the train operators. \u00a0 In 2015, Network Rail<\/a> commissioned a consultant to examine the slopes in the Lock Eilt area, with an initial focus on rockfalls and boulder incursions, but with a subsequently expanded remit to include minor landslides originating from beyond the railway boundary.\u00a0 This study concluded that there was a risk of boulder incursion at this point; the catch fence was constructed to capture such events.\u00a0 The RAIB report<\/a> indicated that in tests the fence design had successfully retained a 3 tonne boulder travelling 30 m down a 35\u00b0 slope.<\/p>\n

The landslide itself had a volume of between 500 and 600 m\u00b3, and thus has a mass of over 1000 tonnes.\u00a0 The landslide scar extended 80 m beyond the railway boundary, with a height difference of 46 metres.\u00a0 As such, the fence could not be expected to retain this landslide.<\/p>\n

The event illustrates the difficulties of assessing the type of failure that might occur at a given location, even when the slopes are known to be potentially unstable.\u00a0 Mitigation works depend on this assessment to be effective, but the range of failure types is so complex that undertaking these assessments is a major challenge.\u00a0 Network Rail<\/a>, and its consultants, have to manage over 16,000 km of railway track in the UK, much of which sits adjacent to slopes. The magnitude of the task<\/a> is clear, especially as the slopes become more vulnerable to failure as a result of climate change<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

On 22nd January 2018 a train was derailed by a landslide at Loch Eilt in north-west Scotland. The RAIB report explains why the landslide was not retained by a catch fence installed at the location. <\/p>\n","protected":false},"author":22,"featured_media":32012,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[144,469,959,80,6,133],"class_list":["post-32008","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-landslide-report","tag-europe","tag-featured","tag-landslide-report","tag-railway","tag-train","tag-uk"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/32008","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/users\/22"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/comments?post=32008"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/32008\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/32012"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=32008"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=32008"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=32008"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}