British Rail 18000 was a prototype mainline gas turbine-electric locomotive built for British Railways in 1949 by Brown Boveri & Cie. It had however been ordered by the Great Western Railway in 1946 but construction was delayed due to World War II. It spent its working life on the Western Region of British Railways operating express passenger services from London Paddington station. 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