A2
the system of transportation that uses trains, or a company that runs trains
Dictionary examples:
I love the railroad. It's my favorite way to be late! (0.0)
The railroad forgot my train, so I walked home! (0.0)
Our railroad is so small, it only has one train! (0.0)
the Pennsylvania Railroad (3.8)
a railroad station (10.7)
railroad tracks (14.7)