Oslo S - Halden, Østfoldbanen vestre linje RE20 Line RE20 runs between Oslo S and Halden on Østfoldbanen's western line. List Map Train to Halden Train to Oslo Change direction Oslo central station Ski station Moss station Rygge station Råde station Fredrikstad station Sarpsborg station Halden station Map view of Oslo S - Halden, Østfoldbanen vestre linje RE20