This is a railroad Windows Vista Wallpaper created by the Vista Team Blog — Brandon LeBlanc. He took the shot during his recent trip around Washington State.
His wallpaper post.

I found this post about different Windows Vista Wallpapers you shouldn’t miss. You have the Vista Curves, Silky Embossed & Corporate Clean.

Go and see all the designs here.

How about changing your Windows Vista wallpaper to a little forresty?

You can download the wallpaper here.