Answer: rails

AnswerCrossword Clue
RAILSSubway lines?
RAILSTrain lines?
RAILSEngineer's path
RAILSStreetcar tracks
RAILSAbe famously split them
RAILS"Split" fence parts
RAILSBars under bar cars
RAILSPool table cushions, informally
RAILSComplains vehemently
RAILSTracks
RAILSInveighs against
RAILSRacetrack fences
RAILSTrain set set
RAILSTrack boundaries
RAILSTrain support
RAILSFence pieces
RAILSComplains about, with "against"
RAILSRoller-coaster supporters
RAILSRoller-coaster parts
RAILSStairway banisters
railshorizontal bar forming a support or barrier
RAILSStock category
RAILSTrain tracks
RAILSCrossties support them
RAILSPieces of ironwork
RAILSTrain need
RAILSPortcullis parts
RAILSLocal supporters?
RAILSSome racehorses hug them
RAILSRacetrack borders
RAILSBanisters
RAILSMarsh birds
RAILSDenounces, with "at"
RAILSSome transportation stocks
RAILSHobos may ride them
RAILSTrack borders
RAILSVagabonds might ride them
RAILSRoller coaster guides
RAILSWading birds
RAILSRacetrack boundaries