The Nynäs Line (Swedish: Nynäsbanan) is a 55-kilometer (34 mi) long railway line between Älvsjö and Nynäshamn in Sweden. The line is electrified and is double track on the 22-kilometer (14 mi) section from Älvsjö to Västerhaninge.The line is trafficked by the Stockholm Commuter Rail and freight trains. At Älvsjö, it connects to the Western Main Line. At Farsta strand there is a connection to Farsta strand metro station, which is a terminus at the Stockholm underground railway.