Van
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I checked the transport schedule online, and it turns out there's a problem with getting from my location to Barnaul and back on the desired dates... The train runs every other day, arriving at 6 am on even-numbered days, and the return trip is even worse. There are no direct buses at all. So, in terms of transportation, it would definitely be better if it were Novosibirsk, otherwise I don't see any viable options right now.