|
The BR Standard Class 3 2-6-2T was a class of 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 2-6-0 tender engine version of the class. Although the boiler shared flanged plates with the GWR No.2 boiler the barrel was shortened by inches and a dome added. Strangely they 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 stoke, 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for renewals incorporating "bolt-on" type pressure relief valves.〔Rear cylinder cover to BR drawing SL/SW/35 being superseded by SL/SW/666 and front cylinder cover to drawing SL/SW/85 being superseded by SL/SW/667 for renewals from September 1955.〕 Although the chassis had many almost identical parts to the LMS Ivatt Class 4 the motion brackets were derived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 2-6-2T」の詳細全文を読む スポンサード リンク
|