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. New Routemaster - The New Routemaster originally referred to as the New Bus for London and colloquially as the Borisbus or Borismaster (a portmanteau on the Mayor of London Boris Johnson who drove their introduction and that of the AEC Routemaster that they were designed as a replacement for) is a hybrid diesel-electric bus operated in London.
A:
Mean Of Transportation