Please answer the following question: British Rail Class 41 (Warship Class) - The British Railways Class 41 diesel-hydraulic locomotives were built by the North British Locomotive Company in Glasgow during 1957 and 1958. Although they were withdrawn before TOPS was introduced British Rail classified them as Class 41. All were named after Royal Navy vessels hence the nameplates each bore a subtitle Warship Class. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Mean Of Transportation