#rail_line__line__railway_line__railwayline  railroad track and roadbed
  supertype:  railroad_track__railroad__railway  a line of track providing a runway for wheels; "he walked along the railroad track"
  part:  railroad_bed  railroad_track
  subtype:  branch_line__spur_track__spur  a railway line connected to a trunk line
     subtype:  loop-line  a railway branch line that branches from the trunk line and then rejoins it later on
  subtype:  trunk_route__trunkroute__trunk_line__trunkline  line that is the main route on a railway

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