Who knows who will be on board? A couple of spies, for sure. At least one grand duke; a few beautiful woman, no doubt very rich and very troubled. Anything can happen and usually does on the Orient Express.
The rottenness of politics in Yugoslavia didn't come as a surprise. The main lesson is that this is a war which could have easily been stopped by Europe. What was lacking was any will to do so. It's an irony of the achievement of Europe that it had lived for 40 years under the assumption of the unimaginability of internal wars, so it didn't know what to do with it when it was confronted with one close up.