Take the Train in your Car

We've done a lot of traveling this summer.  We do the best we can to kill the time with book's on tape, coloring books, etc. but as the driver I can't really play video games on my phone while I drive.  What if there was a train set up kind of like a ferry that you could park your car on for trips.  They could run these trains between decent size cities, where it's too short to fly the family economically.  Salt Lake City to Portland with a stop in Boise for example.  Then you could catch the train, pay a fee, play cards with the family the whole way there and then when you get to where you are going you have your car there.  I could see how this might be nice for tourists trying to get around LA on their way to San Diego.