There's nothing to see from the train on that portion of your train route anyway.
While there may be nothing that tickles Chakk's fancy between Denver and Chicago, I'm a firm believer in beauty is in the eye of the beholder. See for yourself what's along this or any other any route by following along above the tracks on Google Earth. Sometimes it can be difficult to see
which route the train follows (especially in urban areas) so refer to ...
http://fragis.fra.dot.gov/GISFRASafety/ ...for a clearer picture of the route. In addition to those two preview aids, there's also:
• Amtrak Route Guides...
https://www.amtrak.com/route-guides
• Scrollable topographic maps...
http://www.mytopo.com/maps/index.cfm? ...which give a clearer "picture" of the terrain
• YouTube videos
In the desert West of the US there are many ghost towns along the tracks which have names and those names can be found on the topographic maps and the FRA map. Doing a Google search for that name will usually turn up a Wikipedia article with a bit of history about the place. But when you go by that place on the train there may only be dirt roads radiating out from that long-forgotten place where people once lived and worked. So...
...see for yourself!