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Posting some New Zealand kit.
Our first mainline traction was the E Class, later reclassed Eo as more electric locomotives were purchased. Built in 1923 by English Electric.
The 'o' stood for the area in which they worked the Otira Tunnel, at one time the longest in the Commonwealth. The tunnel, which ran for 5.3 miles (8.5) km at a constant 1-in-33 (3%) gradient was too challenging for a steam locomotive.
The class was withdrawn in 1968 and today, one survives in working order at the future site of New Zealand's National Railway Museum.
