Please answer the following question: The GE U23B Diesel-electric locomotive was introduced by GE Transportation in 1968 as a medium horsepower roadswitcher featuring a 12 cylinder FDL engine. It was one of the most successful models of the Universal Series with railroads ordering it from 1968 until 1977 when it was replaced by the B23-7. 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