narrower concept Underground traffic Concept central railway station Concept city railway Concept electrification Concept elevated railway Concept goods station Concept high power rapid-transit railway Concept local traffic system Concept rail goods transport Concept rail junction Concept rail passenger transport Concept rail route Concept rail transport facility Concept rail transport junction Concept rail transportation Concept railway Concept railway station Concept railway traffic Concept rapid-transit railway Concept rapid-transit railway traffic Concept tramway Concept tramway traffic Concept underground railway Concept