This is the New haven railroad bridge spanning.the Hutchinson River. In the background facing east is the Pelham Parkway bridge leading to New Rochelle and City Island. Being familiar with the railroad bridge in the 1970's it was still operational. I hink the closure was strictly a plot addition. The NH rr is now part of Amtrak and passenger service no longer runs along this track. I believe Dobbins' house is now gone swallowed up by the giant CO-Op City complex built adjacent to the bridge. Sad to see how his pastoral section of NYC was paved over. I used to water ski and fish under this bridge.