Hello train enthusiasts! My family and I are planning a trip on the Texas Eagle from Chicago to Austin. I see there is the option of the 21 or 421 on some days. What is the difference on the two routes/trains? Also, other than AAA are there any discounts usually available? I have read in the past that in the summertime sometimes there are discounts for children's fares, is that typical? Our party will be me, my husband and our little train enthusiast (3 years old). We plan on sharing a regular bedroom. I'm having fun reading about all your experiences, but do you have any tips for us? Thanks!