pittsburgh with the duquesne incline

allegheny america angle barge bridges cable carnegie cathedral city cityscape coal commonwealth confluence downtown duquesne east eastern evening fountain funicular glow golden heights high hills incline inclined industrial industry learning mellon monongehela mount mountain north ohio panorama park passengers pennsylvania pittsburgh plane point pretty railroad red revitalization revitalized revolution river rivers shipping skyscrapers steel steep summer track train transportation triangle tug tugboat university vista warm washington