sentences:  Rederi AB Svea was one of the founding members of Silja Line, and operated its ships under the names Skandinavisk Linjetrafik, Scandinvian Ferry Lines, Linjebuss and Trave Line.It also had a Finnish daughter company ("Oy Svea Ab") and another daughter company based in the Netherlands.In 1981 Svea was merged into Johnson Line and ceased to operate as an independent company.