The Mount Gambier-Heywood railway line, a broad gauge line, was opened between Mount Gambier and Heywood near Portland in 1917. From 1953 to 1956, the southeastern lines were converted to broad gauge, with the exception of the Beachport – Millicent and the Wandilo – Glencoe line, which were closed down in 1957. The Kingston – Naracoorte was closed on 28 November 1987. The other southeastern lines, including the line to Heywood, have been out of use since the standardisation of the Adelaide – Melbourne and Maroona – Portland lines on 12 April 1995. There are regular calls for their standardisation.