Can I travel to other countries in Schengen are as a 17 year old by a train?

Can I travel to other countries in Schengen are as a 17 year old by a train? I am from Czechia, i am 17. and me and my friend would like to visit Poland or Austria by a train. Together we already were in Prague by a train and everything was alright (from Brno). but my question is, can i travel by train abroad without an adult, or i have to go with an adult?
submitted by /u/_honza_88

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