Short version: We hadn’t already bought train tickets, because I doubted we’d reach the Malbork, Poland station in time for the next train, but then got to it 5 minutes before the next train to Gdańsk was scheduled to depart. Train hadn’t arrived yet, but the official train PKP app wouldn’t sell me a ticket.
So I got in line for the ticket window, to buy tickets there. At the window with 3 minutes to go, the woman there said (with awful feedback coming through her microphone speaker), “Two minutes, no.” She refused to (or couldn’t?) sell us tickets.
The platform was less than a two minute walk from the window, but I don’t know if she doubted we could reach it in time, or if the computer just wouldn’t allow her to ring them up.
Ironically, the train was 3 minutes late, so I got to watch it arrive after 5 more minutes, sit for two minutes while people got off and others boarded, and then depart, 12 minutes after we’d reached the place.