No date -- 1960s? The NSB Class 27a was a series of 17 Norwegian steam locomotives built between 1910 and 1921 by Thunes mekaniske verksted and Hamar Jernstøperi. Designed for express trains on lines with 9-ton axle loads, they operated until 1970 on routes including Kongsvingerbanen and Rørosbanen, with unit 234 preserved at the Norwegian Railway Museum.

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