I'm looking to see if there are any trains that go between Udon Thani, Mukdahan or Khon Kaen to/from Chiang Mai. Anyplace around those three cities to/from Chiang Mai that have some kind of train would be nice as that is where I will be for two weeks in March. I'm looking for a nice scenic countryside tour and to hopefully spend a few days in Chiang Mai.
I know there are several from Bangkok to Chiang Mai, but I won't be in Bangkok long enough to utilize those ones.
I don't want to fly there, but I am open to other suggestions.