- railway, railroad, railroad line, railway line, railway system - line that is the commercial organization responsible for operating a railway system
--1 is a kind of line
--1 has particulars:cable railway, funicular, funicular railway; cog railway, rack railway; elevated railway, elevated railroad, el, overhead railway; metro, subway, tube, underground; monorail; rail; scenic railway - railroad track, railroad, railway - a line of track providing a runway for wheels; "he walked along the railroad track"
--2 is a kind of track
--2 is a part of line, railway line, rail line
--2 has parts:
--2 has particulars:tie, railroad tie, crosstie, sleeper; track, rail, rails broad gauge; gantlet; narrow gauge; siding, railroad siding, turnout, sidetrack; standard gauge; switch