Answer: rail

AnswerCrossword Clue
RAILInveigh (against)
RAILExemplar of thinness
RAILFulminate
RAILTrain travel
RAILTrain track
RAILRacetrack fence
RAILBalcony encloser
RAILBalcony feature
RAILFulminate (against)
RAILChair ... (wall molding)
RAILCommuting option
RAILPlummet preventer
RAILPart of a track
RAILRacetrack boundary
RAILStaircase safety feature
RAILTravel option
RAILAir alternative
RAILBus or air alternative
RAILTrain wheel guide
RAILCarp
railfence bounding a racetrack
RAILRant
RAILShipping choice
RAILSymbol of thinness
RAILThird .. (power source)
RAILBalustrade
RAILBanister
RAILMarsh bird
RAILIt's on the inside track
RAILThe third one might shock you
RAILComplain, complain, complain
RAILFencing unit
RAILWooden bar
RAILRant and rave
RAILVituperate
RAILA way to go
RAILBalustrade part
RAILFence-sitter's prop
RAILGet a grip on it
RAILAviophobe's alternative