sentences:  "Diana" was the fourth in a series of six near-identical sisters built between 1970 and 1974 for Rederi Ab Sally and Rederi AB Slite for use in Viking Line traffic (three further ships were built by the shipyard for Transbordadores, Mexico).These so-called Papenburg Sisters were highly influential in defining ferry traffic between Finland and Sweden.Although often officially listed as fully owned by Rederi AB Slite, "Diana" was actually owned jointly by Rederi Ab Volo, Rederi AB Slite, Simsonship Ab, Ivar Sund Lidingö and Ab Nils Thorwaldsson Saltsjöbaden.