I took the Transsiberia Express from Moscow to Ulaanbaatar and Beijing a few years back.
Let me tell you that 5 days in a train (Moscow-UB takes 5 days; UB-Beijing is another day and a half) gives you very few opportunities and subjects to shoot. Only at the stations I had a few minutes for shooting, the rest of the 10-15 minutes on the station was usually used up by haggling over the price of food and drink, stretching my legs, and relaxing a bit. Riding a train for so long is like sailing a ship: you'll lust after some solid ground after a while.

Of course I shot inside the train as well (though I only had a Canon Eos at that time) but the number of subjects is rather limited.
And the few out wasn't much to talk about either. At night you don't see a thing as you're riding through sparsely inhabited areas (and it's dark). During the day the scenery doesn't change much as the plains of Russia offer very little noticeable variation.
I'll ride the train from UB to Beijing and back in a few months again, and I'm already looking forward to using my RF cameras.

So small and inconspicious, with a 25mm attached, and loaded with iso400 film... I should be able to get some nice candids (if I'm not too shy).
