#transit_line__transitline  a line providing public transit
  supertype:  line.common_carrier  a commercial organization serving as a common carrier
  part of:  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

No statement uses or specializes transit_line; click here to add one.