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thumb The Hitchin Flyover is a grade-separated single-track railway flyover on the Great Northern Route near Hitchin, Hertfordshire, England, which carries the ''Down Cambridge Flyover line'' over the East Coast Main Line. Constructed between 2012 and 2013, it was built to increase the throughput at ''Cambridge Junction'', a congested flat ("at-grade") junction with the East Coast Main Line just north of , which put severe constraints on capacity on both that line and the Cambridge Line. ==History== Together with the Digswell Viaduct some ten miles to the south, the flat junction just north of was a major bottleneck, as northbound trains diverging from the East Coast Main Line towards Letchworth and thence to Cambridge had to cross one northbound (fast) line and two southbound (fast and slow) lines to access the Cambridge Line. Proposals as part of the original electrification work in the early 1970s〔(【引用サイトリンク】 author = British Railways Board )〕 envisaged a new underpass here and land was set aside for its construction. However, budgetary constraints forced this part of the programme to be abandoned. The land stood empty for many years, but has since been used to provide new housing. A new plan〔 (【引用サイトリンク】 author = Network Rail ) 〕 and subsequent application for an order〔 〕 to build a flyover was approved after an Planning Inspectorate report and public inquiry between 11 and 25 May 2010. Construction was completed in June 2013. Original plans were to build the embankment using aggregate trucked in from elsewhere,〔 but eventually it was decided to build up the embankment using chalk taken from the nearby Wilbury Hills, low-lying chalk hills forming part of the Chiltern Hills, from less than away, removing the need for lorry movements along public roads. The chalk was quarried from just beyond the ancient Icknield Way, which at this point is a public bridlepath between Ickleford and Letchworth Garden City, and the contractor was required to refill and replant the quarry afterwards.〔 Since the embankment materials were locally sourced it also meant that the new embankment was effectively pre-seeded with poppies. This means the entire embankment is covered in red poppies during their flowering season giving the name to the location 'Poppy Bank'. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hitchin Flyover」の詳細全文を読む スポンサード リンク
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