Train service in our country is sub-lame. While Amtrak will work if you're going to certain places(mostly the North-East), it's almost impossible to use as an alternative to driving or flying. Here in Texas, your choices are really limited. You can go to San Antonio and Ft Worth in under 6 hours...maybe, provided there are no delays! But there is a route called the Sunset Limited that runs from Orlando to L.A. and looks to pass through San Antonio where the Texas Eagle heads up to Chicago. Up until Katrina, it used to run through N.O. Not sure what the status is now as that segment has been suspended.
Sunset Limited - Wikipedia, the free encyclopedia
I just looked into getting my folks to take Amtrak from St. Petersburg Fla to Austin. No. They would have to go from Fla - D.C. - Chicago and then to Austin...about 4 days

Amtrak is government run and has to rent tracks from freight companies. It's too bad because it's an awesome way to travel, as you now know. I'd love to be able to go to Santa Fe, Denver, New Orleans or Arizona via Amtrak. When I lived in Cleveland, there were a lot of options as the
Lakeshore Limited runs from Chicago to NYC and then to Boston. The trip through the Hudson Valley is amazing!
Let's hope Obama's administration gives passenger rail a bit of love!
Update: To find trains to New Orleans, search from San Antonio NOT Austin. It will still take you 15 hours(scheduled).