Yes, the plural is correct, as there are five of them: two carrying Canadian National tracks, two carrying Conrail Shared Assets tracks and a fifth that originally carried Interurban tracks but is now used as a pedestrian overpass.
Yes, the plural is correct, as there are five of them: two carrying Canadian National tracks, two carrying Conrail Shared Assets tracks and a fifth that originally carried Interurban tracks but is now used as a pedestrian overpass.