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NZR ED class
The New Zealand ED class locomotive was a class of electric locomotive used in Wellington, New Zealand. They were built by English Electric and the New Zealand Railways Department between 1938 and 1940, and hauled mainly passenger trains on the Wellington region's 1500 V DC electrification, and banked freight trains on the steep section between Paekakariki and Pukerua Bay.
The locomotives featured a unique wheel arrangement, 1-Do-2 under the UIC classification system, and incorporated a quill drive to the driving wheels.
They were found to be hard on the tracks, leading to speed restrictions on these locomotives and their replacement by the EW class on the Johnsonville Line.
== Classification ==
Like all other electric locomotives in New Zealand, the leading letter of the locomotives' classification is E. There are two predominant theories about how the ED class acquired the second letter, D. The first is that it comes from the "Do" of its 1-Do-2 wheel arrangement. The second is from its original allocation to two locations, Wellington and Otira - Arthur's Pass, hence "duplicated". Official records provide no confirmation of either theory.〔Sean Millar, ''From A to Y Avoiding I: 125 Years of Railway Motive Power Classification in New Zealand'' (New Zealand: self-published, 2001), 31.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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