Please answer the following question: Siemens Modular Metro -  The Siemens Modular Metro is a family of electric multiple unit trains for rapid transit systems produced by Siemens Transportation Systems and used by rail operators around the world. The vehicle concept was launched in Vienna in 2000 and is a modular concept allowing many variants of metro vehicles. Previously known as Modular Mobility Siemens still uses the abbreviation Mo.Mo. 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