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The BR Standard Class 3 2-6-0 was a class of mixed traffic steam locomotive designed by Robert Riddles for British Railways. It was essentially a hybrid design, the chassis being closely based on and sharing a number of parts with the LMS Ivatt Class 4, and having a boiler derived from a GWR No.2 boiler as fitted to the GWR Large Prairie 2-6-2T and 5600 Class 0-6-2T tank engines. ==Design details== The design and construction took place at the ex-GWR Swindon Works, along with the 2-6-2T tank engine version of the class, though some details were designed at Brighton, Derby and Doncaster. Although the boiler shared flanged plates with the GWR No.2 boiler the barrel was shortened by inches and a dome added. Strangely the class did not share the same design of wheels as the Doncaster-designed BR Standard Class 4 2-6-0 (76XXX), which also had driving wheels and the same piston stroke, and hence crank-pin throw. In common with a number of the other BR Standard Classes, the chassis design used a number of LMS-designed components including Brake Hanger Brackets, Flexible Stretcher Brackets and Reversing Shaft Brackets. The cylinder covers of engines as built were fitted with "screw-in" type pressure relief valves. From September 1955 revised cylinder covers were introduced for renewals incorporating "bolt-on" type pressure relief valves.〔Rear cylinder cover to BR drawing SL/SW/35 being superseded by SL/SW/666 and front cylinder cover to drawing SL/SW/85 being superseded by SL/SW/667 for renewals from September 1955.〕 Although the chassis had many almost identical parts to the LMS Ivatt Class 4 the motion brackets were derived from the design of those fitted to the LMS Ivatt Class 2 2-6-0 and LMS Ivatt Class 2 2-6-2T. Unlike a number of the larger BR Standards the exhaust steam manifold within the smokebox saddle was a steel fabrication that was part of the welded saddle.〔Confirmed on original BR drawing SL/SW/616 sourced from the NRM〕 In a number of the large BR standards (BR Standard Class 6 and Class 7 engines) the exhaust steam manifold was a steel casting welded into the saddle during manufacture.〔Confirmed on original BR drawing SL/DE/19620 sourced from the NRM〕 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「BR Standard Class 3 2-6-0」の詳細全文を読む スポンサード リンク
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