Is there a particular reason why they want to go rail? While it was the romanticized way to get around for tourist to get around Europe a decade ago, flights are really cheap now, to the point where it may be cheaper than a rail pass. Once they decide where to go, have them look at airfare and see which is better. Of course, you may lose the flexibility of just hopping on the train and also the camaraderie of meeting fellow travelers (though the truth to that last bit is that they'll likely lose touch anyway when they come back, so not much lost there IMO).
Random tips off the top of my head...
Charging:
- Bring a rechargeable battery pack to charge electronics on the go, something like
.
- Buy new
, and keep factory charger as spare.
Download Google maps of the local city to use offline (search for "Ok Maps" command to see what I'm talking about.
If you happen to need a new cell phone plan, look into one with worldwide coverage like T-Mobile... data & texting included in most countries in Europe.
Clorox wipes for public restroom use (travel size)
Baby wipes for cleaning in general (travel size)