A few more I came across - all circa 1905:
The first bridge in the background is the Putnam Bridge. Note the old semaphore signals and what appears to be a unique double tank work car on the left.
Now from the opposite direction showing more of the Harlem riverfront area. In the background is the Highbridge Aqueduct when it was still all stone, with the Washington Bridge north of it.
The area along the river between the two bridges is where we would go to watch construction of the Major Deegan Expressway in the early 50s.
While not of the Put, this is a photo of the construction of the 153 St bridge across the New York Central Mott Haven coach yard. The bridge would connect Morris Ave on the far side with Mott Avenue where the photographer is standing. Mott Ave would later become part of the Grand Concourse.
To the right of the photo is where the Hudson Division would separate from the Harlem/New Haven line. The Hudson Division trains would head toward the Harlem River and then pass through the area shown in the first two photos.
I'm sure Tom would be interested in knowing that just to the right of the photo is what would become the location of Cardinal Hayes HS .
I'd take the Morris Ave bus down to 153rd and walk across the bridge over the train yard to school everyday.
Jim