Please answer the following question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Sri Lanka Railways M7 -  Class M7 is a type of diesel-electric locomotive built for Sri Lanka Railways by Brush Traction UK and imported in 1981. This locomotive has the shortest length least power and least weight compared to other diesel locomotives of Sri Lanka.
Answer:
Mean Of Transportation