vesicles
Colonel
Probably should do one between Austin and San Antonio as a trial run.
IMO, taking a train between Austin and San Antonio would not be worth it. I would just drive. It's only an hour. once you get to San Antonio, you would have to figure out how to get to places in town. Public transportation is notoriously bad in Texas. It would be more of a hassle for a such short drive, IMO.
It would not be such an issue in other cities on the east/west coast, where public transportation is good.