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 Wet wipes. There's likely no water in the toilet compartments.
 Toilet paper. There's no toilet paper anywhere.
 Water, in summer (lots of it.) The opportunities for jumping off the train to buy bottled water may be limited and erratic, and may involve narrow parameters, and if you don't speak some of the language you might not be able to find out how long the train will stop; then go make the purchase  and even then you might need to be assertive  and get back aboard before departure.
 Timepiece. You might not know where you are unless you know what time it is. It's best to know when to look out for your station, because nobody will announce it.
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