CTA Chicago train elevated known as L

cta elevated l chicago transit rail commute overhead tracks urban railway city railways elevated commuter metropolitan rail public conveyance transit carriages commuter hub rail transportation city commuting overpass transit urban ridership railcar journey downtown railway commute dynamics railway infrastructure urban mobility transit network public commuters elevated passage public transportation commuter route urban train service rail passenger elevated circuit city railway system economic epicenter professional hustle financial institutions commercial real estate executive presence business travelers corporate environment downtown flow street activity commuter life evening commute streetlight glow pedestrian hustle city movement metropolitan pace public buses daily life rush hour swirl economy