single photos View from the back of a moving train

I love it. I have some train images in my folder but none like this. Alexandru Averche recommended to me to look at-

http://www.bumbutz.com/sessions/6/title.htm

The only thing that I would do is select the sky and in Photoshop Levels darken it up a bit. In Curves I would find the darkest point in the image and make it 100% black. But that is just my opinion.