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The D57 class was a class of 4-8-2 steam locomotives built by Clyde Engineering for the New South Wales Government Railways in Australia. The tenders were built by Mort's Dock. ==Introduction== The locomotives were among the heaviest of locomotives in Australia with a axle load and this along with their width restricted their sphere of operation to Thirroul on the Illawrra line, Wallerawang on the Main Western line and Junee on the Main South line.〔"King's of the Road" ''Roundhouse'' October 1979 page 23〕 They were not permitted to operate on the Main Northern line due to load limitations on some bridges and a tighter loading gauge They had the highest tractive effort of any conventional engines used in Australia and were of approximately equal capability to the 60 class Garratt locomotives. They were very reliable and had the nickname ''Lazy Lizzies'' because they made heavy workings seem effortless. Another nickname was bestowed on the class, ''Chuckling Charlies'' due to their syncopated exhaust beat.〔±Locomotives, A Guide, written by Gifford Eardley〕 The three cylinder design fitted to the class gave it a distinctive off-beat exhaust sound when climbing upgrade. This design was also fitted to the 58 class. However, a couple of features, such as the Gresley conjugating valve gear fitted to these locomotives has been the source of debate as to its efficiency. 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「New South Wales D57 class locomotive」の詳細全文を読む スポンサード リンク
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