#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
  part:  #railroad_tie  #rails
  part of:  #rail_line
  subtype:  #broad_gauge__broadgauge  a railroad track (or its width) broader than the standard 56.5 inches
  subtype:  #elevated_railway__elevated_railroad__el__overhead_railway  an electric elevated railway
     subtype:  #roller_coaster__big_dipper__bigdipper__chutethechute  elevated railway in an amusement park (usually with sharp curves and steep inclines)
  subtype:  #gantlet  the convergence of two parallel railroad tracks in a narrow place; the inner rails cross and run parallel and then diverge so a train remains on its own tracks at all times
  subtype:  #rail_line__line__railway_line__railwayline  railroad track and roadbed
     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
  subtype:  #narrow_gauge  a railroad track (or its width) narrower than the standard 56.5 inches
  subtype:  #railroad_siding__siding__sidetrack  a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass
  subtype:  #standard_gauge  railroad track having the standard width of 56.5 inches
  subtype:  #switch.railroad_track  railroad track having two movable rails and necessary connections; used to turn a train from one track to another or to store rolling stock

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