They don't sell beer or wine, but (unlike most European countries) you can't drink your own alcohol on Polish trains, only beer or wine bought & consumed in the restaurant or bar car.
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Yes, you can drink alcohol on many trains in Europe and the UK.
You may bring your own food and beverages onboard for consumption at your seat or private Sleeping Car accommodations. However, you can only consume food and beverages purchased in Dining and Lounge Cars in those cars. Personal food and beverages are allowed in the upper level of Superliner Sightseer Lounges.
However, if you're 16 or 17 and accompanied by an adult, you can drink (but not buy) beer, wine or cider with a meal. If you're 16 or under, you may be able to go to a pub (or premises primarily used to sell alcohol) if you're accompanied by an adult.
At 13, Burkina Faso is the country with the youngest age of alcohol consumption. Burkina Faso, a West African country with a population of 20.9 million (2020), has an area that spans about 170,255 miles.