The American railroad has a unique place in popular American culture. It's the glue that binds it's pioneering past with it's industrial present. Like everything American, they do it in a big way - hugely powerful engines pulling double-decker trains extraordinary distances.
The might and metal and almost singular direction are i=powerful metaphors.
This piece is called Kentucky Street. I cannot recall exactly wehre in California I took this, but I know for absolute certainty that it wasn't on a street called 'Kentucky Street' so I went with that.