Aerial view looking upstream at the Schuylkill River showing Manayunk (right) and the Pencoyd Iron Works in Lower Merion (left). The four bridges, from top to bottom, are the Pencoyd Bridge; the Towpath or Blackie Bridge, which served as a mule crossing when the canal boats were operating, and was later turned into a railroad crossing; and the concrete Pennsylvania Railroad bridge, the the Green Lane Bridge behind it. This is probably the early 1950s, as the view shows the Schuylkill Expressway under construction on the left.