So, you've been on a train for 12 hours overnight, whats the logical choice to do the next night?

Thats right - get on a 17 hour train!

I spent 30 hours out of 42 on a train. It could have been quite a horrible second journey, but having picked up the guys in Surratthani, we also managed to increase our group by 4 at various times hanging around in Bangkok train station. And other than the fact I didn't sleep at all on the train (due to broken seats, noisy kids and sprawling seatmates :-P) the journey was quite fun. We did run out of card games during the three hour delay though.