If you are considering taking a 3rd class car for an overnight train trip, don't. While it's a great scenic adventure to Kanchanburi or Aranyaprathet, it is not appropriate for longer trips. These cars have thinly padded wooden or plastic seats that will reduce your bottom to tears. Worse, there is no guarantee of a seat in a 3rd class car, and they often become standing room only nightmares, particularly during peak periods. If 3rd class is all that is available for a long train journey, you are better off taking the bus instead.