So, Junebug, to clarify -
Any time on Amtrak beats time in the office. That being said, my opinion is that from a scenery standpoint, the Texas Eagle is perhaps the loneliest ride to the West. You wander through endless fields flatlands between Chicago and St. Louis. You will then get some excitement crossing the Mighty Mississippi River and following it for a few minutes. Some of the most scenic sights are then in the middle of the night as you progress through Missouri and Arkansas. East Texas is a forest, then more gently rolling plains as you go into Dallas. Yes, you can see the book depository to the North (Station Side) as you cross over Elm Street and onto the grassy knoll.
From Dallas to Fort Worth, you'll travel along the old Rock Island line and pass through junk yards, back yards, and jail yards. You'll also pass through the Bell Helicopter plant. Well, sort of. You'll pass between the parking lot and the main plant. You'll then pull into Fort Worth, followed by one of the busiest railroad interchanges in the US - Tower 55.
Fort Worth to San Antonio is pretty straight forward. Depending on the day of the week, you could spend several hours in the middle of the night in San Antone' hooking up to the Sunset Limited.
From San Antonio to El Paso is flat dessert. Parts of El Paso are incredible as you pass mere yards from the Mexican Border. Enjoy it before it is only a big, beautiful, impenetrable wall.
You'll miss the Rockies between El Paso and LA, but you'll get some incredible, pristine, dessert views. You'll likely spot a saguaro or pipe organ cactus
Finally, you'll arrive in LA probably around 4 AM - long before anything is open. Unless you're in a sleeper, you'll be unceremoniously booted to the station.
In conclusion, I love Texas. I miss Texas. I bleed Cowboys blue. But if I had my dream trip to the West, it'd be the SWC from Chicago to LA, Coast Starlate from LA to Seattle, then the Empire Builder back to Chicago.