It would be terrific if we could meet up while I'm in Bucharest. On a visit to Portland a few years ago, I met up with Shadow Wrought; it was great fun. Of course, he lives there, not a long train ride away, but if it would be an adventure for you, I'm happy to provide the excuse!
I've ridden trains several times since coming to the East Coast, but only once did I ride overnight in a sleeper car. That was back in 1985, going from Kiev to Odessa. I don't think the long-distance trains in the Soviet Union are a good yardstick to judge the experience by, or at least I hope they aren't. The height of the Soviet Union was also its depth, if you know what I mean. Food, beds, noise level, overall comfort... I'm sure your experience would be better than mine!
It's been very mild here in the U.S. The jet stream is way north, keeping all that arctic air up in Canada and shoving it over to Europe. A very strange winter all around.