Following on from the thread on the soon to be withdrawn Schönes-Wochenende-Ticket at https://www.railforums.co.uk/threads/end-of-schönes-wochenende-ticket.175571/, does anyone know whether you have to buy the Quer Durchs Land Ticket in advance, or can you buy it on the day? And can you buy it from a ticket machine or only at the ticket office?