On the American Spokane Portland and Seattle Railway locomotive number 525 was the only steam locomotive in SP&S class O-2. It was originally built for Northern Pacific by the Schenectady Locomotive Works. Builders Number 46878 was built in February 1910. 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