Since last year, the sister ship M / S Visborg has been mainly in traffic on the Visby-Nynäshamn line.
Both Visborg and Thjelvar are powered by liquefied natural gas (LNG) and, according to the shipping company, emit 20 percent less carbon dioxide than the other ferries.
The vessels are built by Guangzhou Shipyard International Company Limited in Guangzhou, China.