T21, originally T2, is a diesel-hydraulic locomotive operated by Swedish State Railways () and Nora Bergslags Järnväg (NBJ) of Sweden. 60 units were built between 1955 and 1963 by Maschinenbau Kiel and Svenska Järnvägsverkstäderna, based on the German DB Class V65 and technically identical to the MaK 800D. The class replaced steam locomotives on branch lines and remained in service until the 1990s.
Design Each locomotive had an eight-cylinder MaK MA 301A diesel engine driving a Voith L37zU hydraulic transmission, with an output of . It had compressed-air and hand brakes and equipment for multiple working.
The order consisted of 56 locomotives, of which ten were to be built in Sweden with a Swedish hydraulic transmission, designated T3, later T22. The Swedish transmission did not work well, and only four were delivered, the rest with a German transmission. Two units were later rebuilt to T21s. NBJ bought four T21 units in 1963.
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