The locomotives were assigned to the depots in Šķirotava, Jelgava, Dyneburg, Rezekne and Krustpils. In September 1940, after the annexation of Latvia by the USSR, the steam locomotives were taken over by the Soviet Railways. During the war, some of the steam locomotives were captured by the Germans, 5 of them were taken over by the Soviet army again and after the war there were 12 steam locomotives of this series in the USSR. They were withdrawn by the railway in the 1950s, and a few were transferred to various industries. After 1945, there were two Tk locomotives on the Polish State Railways: No. 235 (marked as OKa1-1) and No. 242 (marked as TKa-242). Oka1-1 was withdrawn from service in 1969, and previously ran service trains in the area of the Łazy marshalling yard. The TKa-242 steam locomotive worked until 1957 in the depot in Kutno. The OKa1-1 locomotive was selected for museum preservation and is now housed in the Railway Museum in Warsaw. After the war, three locomotives were used on West German railways (withdrawn at the end of 1951), and one on East German railways. The other two were lost, while OKa1-1 was left behind, evenutally being housed in the Warsaw Railway Museum.
