it's simple. The rails in the railroad was layed down on a road.
The Underground Railroad. The Underground Railroad.
The Underground Railroad?
underground railroad
The Chicago and Galena Union Railroad
Central Pacific Railroad.
The Central Pacific Railroad was first built in Sacramento, California. The Central Pacific Railroad is the former name of the railroad network that formed part of the First Transcontinental Railroad.
It is not named for a state but for a railroad of the same name.
Only if your talking about a name or a pronoun.
Railroad
underground railroad
it came from a railroad
That would be a "trestle"