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Built by my favorite railroad, and being raised not far from it ...... my favorite was the Newark Bay Bridge. A vertical lift bridge between Bayonne and Elizabeth NJ, built by the Central Railroad of NJ back in the 1920's to replace older bridges.
ConRail abandoned the line ... the Coast Guard deemed the bridge a hazard to navigation ... and it was torn down (actually, blown up). Four tracks ... four separate lift sections ... closer to 2 miles long than 1 .... I thought it was pretty cool.
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Since I now live not far from it, I'll include this reinforced concrete viaduct that was built by the Lackawanna a hundred years ago over the Paulinskill River in northwestern NJ. Long abandoned, now just illegal activities ... kids racing dirt bikes and atv's on it, and people exploring its inner structures.
I believe they are planning to re-activate the Paulinskill viaduct (which when you come upon it is both immense and in some ways, scary) as part of the proposed Lackawanna cutoff that has been the center of some controversy for years. I don't know if they actually have given the go ahead for the project, is supposed to be a passenger line bringing people in from the Poconos and allowing them to commute to NYC, but there are those opposed to it saying it will become the route for garbage trains and oil trains and such (which isn't likely, from what I have read of that line, the grades are too high for those kind of trains).
