I would comment that until Congress comes to its senses and repeals the Patriot Act (they just renewed it), some of the statements made below may be untrue.
That said, I have not yet encountered any serious problems during my career of historic bridge photography. As such, Calvin's advice below is sound.
Remember... there is no law that says you cannot take a picture of something if you are standing on public property, and, are not blocking or impeding the flow of traffic. If the "railroad police" don't want you taking pictures of their bridge and you're standing alongside a public street, highway or road, they need to cover it up with a big blanket, or, one of those tarps you get at the Wally World.
Always stand on either public property, or, private property on which you have the owner's permission.
As long as you are a bridge enthusiast and not a terrorist, you should be fine.
Quite an undertaking!
The facts ought to include the recycling of this bridge from it's original site near Kentucky Dam. This bridge was moved nearly a hundred miles when the dam was built.
I passed this bridge on my way to see the Duck River Bridge. I was not expecting it, so to all of a sudden see this gigantic bridge was a surprise. I have searched for info on this bridge but can not find anything. The photos were taken in a hurry because I already have 2 strikes against me from the "railroad police" in Tennessee. Trespassing AND taking photos on or near a railroad bridge gets you investigated by the FBI in certain cities. I just was not willing to get in trouble this time.