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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク NZR WW class ： ウィキペディア英語版 NZR WW class The NZR WW class was a class of 4-6-4T tank locomotives that operated on the New Zealand national railway network. They were the final development of the six coupled tank engine in New Zealand, the penultimate class of tank locomotives to be built for NZR, and the first class of tank locomotives to be built with superheaters. ==Introduction== The WW class were based on the earlier WG class 4-6-4T tank locomotives, but with a reduced boiler pressure of 180psi and larger cylinders. The initial batch comprising locomotives WW 556-575 were built at Hillside Workshops in 1913, and initially carried the WG classification before being reclassified as the WW class, the 'W' indicating that these locomotives were intended for suburban work in Wellington. Following the success of the first twenty locomotives, Hillside delivered a further thirty locomotives which were classified WW from new. A further fourteen locomotives were rebuilt from the WG class at Hutt Workshops in two batches between 1940–42 and 1950-52.〔Sean Millar, ''The NZR Steam Locomotive'', NZR&LS 2011, p. 304.〕 Although most of the class were built with piston valves, WW 565 was delivered with slide valves, which were not suited to superheated steam, leading to their replacement with standard piston valves. 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「NZR WW class」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.