Port Morris, The Bronx
In the 1850s, Gouverneur Morris II (son of one of the framers of the constitution) laid out Port Morris as an industrial area on a 100-acre marshy headland on the banks of the East River. Morris, who was a Director of the New York and Harlem Railroad, had the two-mile Port Morris Branch run from the NY&H main line in Melrose down to his new development.
The neighborhood retains its gritty commercial feel, although there are quite a number of folks living there. It might be of value to place a station somewhere after the line crosses onto the mainland, although issues with cost and congestion on the very active line might make it better just have the first station after the Circumferential Line moves from the NYCRR Line to the (currently abandoned) Port Morris Branch.
The railroad bridges through Port Morris carry six tracks on four separate bridge spans. The two upper spans are the approaches to Randall's Island that each carry a pair of tracks to the Hell Gate Bridge. Staggered below them are two "local" lines connecting the Harlem River Yard in the south with the Oak Point Yard to the north, the westernmost line of which appears to be unused.
There are a pair of lighterage docks on the waterfront at the end of East 135th Street. Presumably these brought cars in on barges that were destined for nearby businesses or warehouses and ran on tracks down the middle of streets. The street-level tracks are long paved over, although I did see a siding track peeking out of a driveway on Locust Avenue.
While Port Morris has a clearly industrial feel, there are quite a number of residential buildings nestled among the commercial buildings.
Next: Harlem River and Port Chester Line