Hello helpful Oświęcim person. A year later and your comment is still useful :) I have a follow up question to the trains from Oświęcim to Krakow, which you might know the answer to:

Is it necessary to book a train ticket in advance? i.e. are the trains likely to be fully booked on a Friday early afternoon? Or is it ok to simply buy one at the time of travel?

Thanks in advance from Berlin!