#railroad_track__railroad__railway  a line of track providing a runway for wheels; "he walked along the railroad track"
  supertype:  track.route  road consisting of a pair of parallel rails providing a runway for wheels
  subtype:  broad_gauge  elevated_railway  gantlet  rail_line  narrow_gauge  railroad_siding  standard_gauge  switch.railroad_track
  part of:  rail_line
  part:  railroad_tie__tie__crosstie__sleeper  one of the cross braces that support the rails on a railway track; "the British call a railroad tie a sleeper"
  part:  rails__rail__track  a bar or bars of rolled steel making a track along which vehicles can roll

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