The Nederlandse Spoorwegen (NS) Class 200 diesel locomotives were built for shunting duties. 169 of these small locomotives numbered 201-369 were built by Werkspoor from 19341951. They were known as Sikken (Sik in singular goats) by rail enthusiasts and locomotor by railway staff. Fifteen of these locomotives were built with a retractable crane. Many are preserved but some are still in service with the Netherlands freight operator Railion. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
The answer to this question is:
Mean Of Transportation