Under the National Security Act, railroads are private property, and banned from hunting, due to "national security", you will get a serious fine, the railroad will press charges, the constabulary will not hesitate to get you. In some states, there is a provision that you need the adjoining landowners permission, sometimes both the railroad AND the adjoining landowners, the railroad will not give permission, liability, although we all hunted on railroads with success as kids, and didn't wreck a train! Those days are gone into the dim past. I used to have permission on two rail roads, my uncles were Chief Engineers! Abandoned railroad right of ways are still owed by the railroad, or be sent back to the landowners who adjoin. In Missouri, and Nebraska, the state does have right-aways which are deeded, some you can hunt, some a reserved for bikes, hikers, bird watchers, etc. Kansas for example publishes advisories that Railroad lines cannot be hunted, I have even heard it on the radio!