The Finnish VR Class Tk3 (original classification 'K5') was a 2-8-0 light freight locomotive. It was the most numerous steam locomotive class in Finland with 161 built. 100 locomotives were constructed between 1927 and 1930,Katajisto, Juhani. (1985). Eilispäivän kulkuneuvoja. p. 42. Hämeenlinna:Tietoteos. . with a further 61 ordered and constructed 1943–53.Sakari K. Salo:Höyryveturikirja, They were numbered 800–899, 1100–1118, and 1129–1170.
