Question: The SP&S Class A-1 steam locomotives were a group of 5 identical locomotives. They were used in the rail yards at Portland Oregon and Vancouver Washington from 1907 to 1952. They were replaced with Diesel-Electric switch locomotives. 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?
Answer:
Mean Of Transportation