moving commuter el train crosses over lake street and chicago river alongside a bridgehouse

angle area beams bolts busy cable city cityscape classic crossing door fence fixture gloomy grate house iconic iron lake light lights lock looking moving nuts over overhead path pedestrian post railing reflection riverwalk rush security stairwell steel structure system train urban wake water wells windows architecture bridge bridgehouse building caution chicago commute commuter concrete downtown drive el elevated exterior illinois loop pedestrians restricted river road sign sky snow staircase stairs street tower tracks traffic transit transportation travel wacker