It's a great capture of the Southwest Chief on it's way from Chicago to L.A.
The shots are absolutely professional and stunning, a must-watch. Some wigwags and semaphores remain and one can see the whole beaty of the prairie.

I can't wait to run the Chief myself in RW when the Superliners come (and hopefully a Genesis from RS.com).
http://www.youtube.com/watch?v=CGPSOZIa824&feature=channel_video_title
(The uploader also has a lot of other great railfanning videos and even videos of NASA launches.)