”M/S Silja Symphony” is a cruise ship and Ro-Pax ferry, launched on 15th May 1990, completed slightly behind schedule and delivered 30th May 1991. The ship was in construction at Wärtsilä Marine, Finland, when the shipyard went bankrupt. Nevertheless, “Silja Symphony” was finished at Masa-Yards shipyard, Finland and acquired by “Silja Line”. Unlike, the sister ship “M/S Silja Serenade”, the hull of “Silja Symphony” was made out of aluminium to lighten the overall weight. Very soon after it arrived at the home port of Stockholm, on 1st of June 1991 the cruse-ferry started to serve the route Stockholm–Helsinki. In 1996 the engines were upgraded wit a water-spray technology to reduce the nitrogen oxide emissions. Similar to her sister-ship, in June 1999 a intermediate stop at Mariehamn was introduced to fulfil the EU tax-free legislation. From that time, the usual route of “Silja Symphony” is Stockholm–Mariehamn–Helsinki. In 2006, the “Silja Line” was sold to “Tallink Group” and respectively the ownership of “Silja Symphony” changed. Just before the transfer the interior of the ship was rebuilt at Turku shipyard, Naantali.