Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Hka - Hnefoss Jernbanevogn- og Karosserifabrikk A/S trading as Hka and at first known as Hnefoss Karosserifabrikk A/S was a manufacturer of bodywork for buses trucks and trains. The company was in existence from 1936 to 1968 and was based in Hnefoss Norway. Among the company's products is Oslo Tramway's SM53 trams the Trondheim Tramway's GB Class 3 tram and the Norwegian State Railways Skd 221 shunters.
The answer to this question is:
Company