Johnson Line (Swedish: Johnsonlinjen) was a Sweden-based shipping line founded in 1904 as a subsidiary of Rederi AB Nordstjernan. In 1982 Johnson Line absorbed Rederi AB Svea, another Rederi AB Nordstjernan -owned company, hence becoming a member of the Finnish-Swedish Silja Line consortium. Johnson Line ceased existing as an independent company in 1990 when it merged with the fellow Silja Line member to Effoa to form EffJohn.
References
Johnson Line Wikipedia(Text) CC BY-SA