The NS Class 3400 diesel multiple units were built by Duewag Talbot and SIG between 1996 and 1998. They operate in the Netherlands. They are operated by the Nederlandse Spoorwegen and some are currently on loan to Syntus. The class is referred to as DM'90 or Buffel by the Dutch which means Buffalo. Class 3400 are now the only DMUs in service with the NS. DM'90 is short for Dieselmaterieel 90 meaning Diesel rolling stock from the 1990s. 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