North to south in the dead of winter is interesting. On the day I left Chicago it was -5ºf and a snow storm hit the city just as my train left. We spent the day slowly moving through a wall of falling snow until the sky went dark, but during the night my train left the flat, snowy north and by sunrise I was speeding through dense woods with exposed earth everywhere.
Sure, I totally understand how weather and latitude works, but it's still just cool to have your immediate environment change so drastically while asleep. But this is just another example of how riding the train is so neat. The combination of the remoteness of where train tracks are coupled with the slower speeds in comparison to a plane- no other mode of travel has ever given me this feeling.