how you crossed from Copenhagen to Malmö before the Öresund bridge was built

One of the ferries used on this route: "Malmöhus was a train ferry built by Kockums Varv Ab, Malmö, for Swedish State Railways (SJ) and entered service in 1945 between Malmö and Copenhagen. Malmöhus ceased carrying passengers in 1974, and was withdrawn in 1986. Following a failed attempt to use her in a stationery role in Oslo, Malmöhus was scrapped in 1998 in Spain."