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Is it possible to keep it fresh during a long distance travel by train? Normal styrofoam boxes won't work I guess, what about thermos flasks?

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My dad used to buy icecream after a long day work for us (it was a 3 hour drive.) He used styrofoam boxes with some dry ice. Not sure if it can hold up till 12 hours.

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Yup, dry ice is the key. To make it last longer, use more dry ice (and the best-quality ice chest you can fit in your luggage). –  Marti Oct 19 '11 at 22:13
Hadn't thought about dry ice. Sounds good, thanks. –  Markus Oct 19 '11 at 22:38

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