#line.common_carrier  a commercial organization serving as a common carrier
  supertype:  common_carrier__carrier  a person or firm in the business of transporting people or goods or messages
  part of:  transportation_system
  subtype:  airline_business__airline__airway  a commercial enterprise that provides scheduled flights for passengers
  subtype:  railway_system__railwaysystem__railway__railroad_line__railway_line__railwayline  line that is the commercial organization responsible for operating a railway system
     subtype:  cable_railway__cablerailway__funicular__funicular_railway__funicularrailway  a railway up the side of a mountain pulled by a moving cable and having counterbalancing ascending and descending cars
     subtype:  cog_railway__cograilway__rack_railway  railway for steep mountains; a cogwheel on the locomotive engages cogs on a center rail to provide traction
     subtype:  metro__subway__tube__underground  electric underground railway
     subtype:  monorail  a railway having a single track
     subtype:  rail  short for railway; "he traveled by rail";1 "he was concerned with rail safety"
     subtype:  scenic_railway  small railway in an amusement park
  subtype:  steamship_company__steamshipcompany__steamship_line__steamshipline  a line responsible for the operation of a fleet of steamships
     subtype:  fleet.steamship_company  a group of steamships operating together under the same ownership
        subtype:  argosy  one or more large merchant ships
  subtype:  transit_line__transitline  a line providing public transit
     subtype:  bus_line__busline  an organization responsible for operating a bus transportation system
     subtype:  trolley_line__trolleyline  a transit line using streetcars or trolley buses

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