1896 Bridge: (Bridge Hunter, 4-track swing bridge) (The only other 4-track swing bridge I have seen is still in Conneaut, OH.)
1954 Bridge: (Bridge Hunter, twin 2-track lift; 3D Satellite)
This is on the train route that leads to Grand Central Station.
Since there is no counterweight, this is not a bascule bridge. It is an old fashion drawbridge like the ones that used to be used over the moat of a castle. The steam engine had to be strong enough to lift the full weight of the bridge.
|December 1892 Scientific American.|
|Opening of the Harlem Ship Canal Source NYPL|
1896 4-track Swing Bridge
|Francis Otterbein posted|
Manhattan Harlem Railroad Bridge at Park Avenue, undated.
[We can tell by the smoke coming out of the smokestack on the left side of the bridge that it was still steam driven when this photo was taken.]
|1896 Bridge Hunter|
[The men repairing a pin connection in 1916-17 provide scale for the size of the steel beams. The bridge carried "some 700 train or engine movements per day."]
1954 Lift Bridge
|Photo taken by Pi.1415926535, License: Creative Commons Attribution-Share-Alike (CC BY-SA), from 1954 Bridge Hunter|
|Comment by Peter Metrinko on Francis' post|