Have you ever just wanted something different to do for a change? Or maybe you are just plain sick of listening to the radio. Librivox.org is a website dedicated to providing audiobooks on subjects found in the public domain. There is no fee to listen. Just download the mp3 chapters and go for a drive.

They do request users dedicate some time to contribute some chapters and I think  if I can find such a "railroad related book" I just might do it.

 Take a look www.librivox.org