I'm thinking it's the Scherzer type rolling lift bridge over the Bronx River. It carries Amtrak trains. It never had an official name. Amtrak refers to it as bridge 3.40 which it likely a mile post ID. Old pictures show it had the same type control house that we see in the show. It was originally three spans side by side. At some point one span was removed, the control house removed and it was left down permanently. It may well be the filming was done at this time. That would explain the scene with a crew moving track.