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The 5AT Advanced Technology steam locomotive is a conceptual design conceived by the British engineer David Wardale, and first described in his definitive work on modern steam, ''The Red Devil and Other Tales from the Age of Steam.'' Wardale's purpose in putting forward the "Super Class 5 4-6-0" design concept (as he then called it) was to offer a future for steam hauled trains on the main lines in the UK on which the use of heritage traction is likely to be gradually phased out as the speed and density of commercial rail traffic increase. Work on the project was suspended in March 2012 following completion of a project Feasibility Study and subsequent failure to raise the finance needed to complete the detail design and construction of the locomotive. ==Proposal== Wardale's proposal was for a locomotive that would: * be acceptable to the British railway authorities by conforming with the size and weight of the BR 5MT Class 4-6-0 locomotives that have operated on British main lines since 1951; * offer a level of performance needed to integrate steam-hauled charter trains into the modern high-speed rail-system without causing bottle-necks; * offer much greater reliability and much lower operating costs than heritage steam locomotives. The April 1998 edition of the Steam Railway magazine contained an article by Wardale titled "Whither Steam Now?" which included reference to a "locomotive of Class 5 4-6-0 format - calling it a 5GT - that would outperform any British Pacific." Still described as the 5GT in a Feb 2001 Railway Magazine article titled "Wardale reveals £1.7 million 'new steam' proposal for the heritage market", the name 5AT first emerged in a letter from Alan Fozard to the editor of Steam Railway Magazine issue 259 in June–July 2001, which coincided with the formation of the 5AT Project.〔http://www.5at.co.uk〕 The 5AT in its final conceptual form remained almost identical in size and weight to the BR 5MT, sharing the axle spacings and being just 4 tonnes heavier, with axle loads of 20 tonnes on each driving axle and 10 tonnes on each bogie axle. Where it differed in size from the 5MT was in its tender which was massively enlarged to carry large quantities of fuel and water to extend its operating range. Such a large tender would also have provided space for the locomotive-carried parts of advanced signalling systems such as ERTMS. The 5AT's four-axle tender would have had a gross weight of 80 tonnes with a fuel (light-oil) capacity of 7 tonnes and water capacity of 46 tonnes (12,000 US gallons). 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「5AT Advanced Technology Steam Locomotive」の詳細全文を読む スポンサード リンク
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