The Nagoya Municipal Subway 5050 series (名古屋市交通局5050形) is a rapid transit electric multiple unit operated by the Transportation Bureau City of Nagoya on the Nagoya Subway Higashiyama Line in Japan since 1992. 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?
Mean Of Transportation