Hard to imagine this was a thriving Rail line along the Canal in NJ.
Picture at Lambertville Station Restaurant looking up the Canal and the last bit of rail left.
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Read this article from 1858 touting the virtues of canals over railroads.
www.scientificamerican.com
Shortly after that most canals in the US were killed by railroads.
Fast forward to the 1930s when trucking started taking bites out of rail freight. Then throw in the interstate highway system after WWII. Trucking took a huge bite out of rail.
Rail shines at bulk transport.
This wiki article explains it pretty well. The multiple bankruptcies and mergers in the 70s and 80, Amtrak, ConRail, etc... that came out of the Penn Central failure.
As I've mentioned many times before, there used to be multiple routes between the same places due to so many different railroads that were competing with each other. As they merged, they didn't need multiple routes, so they kept one route and the other 2-3 redundant routes were abandoned.
That's the main reason there are so many abandoned intercity lines across the country, particularly in the northeast corner of the US.
Trucking is why there are so many abandoned intracity lines in urban areas.
en.wikipedia.org