Topic summary
Russian gauge

Extracted from the Wikipedia article 5 ft and 1520 mm gauge railways.
Expansion
Unlike in South Manchuria, the Soviet Union's reconquest of southern Sakhalin from Japan did not result in immediate regauging of the railway system. Southern Sakhalin continued with the original Japanese 1,067 mm (3 ft 6 in) gauge, simultaneously with the Russian gauge railway, constructed in the northern part of the island in 1930-1932 (Moskalvo-Okha). Sakhalin's railway network has no fixed connection with the mainland. Before 2019, rail cars coming from the mainland port of Vanino on the Vanino-Kholmsk train ferry, operating since 1973, had to have their bogies changed in the Sakhalin port of Kholmsk. In 2004 and 2008 plans were put forward to convert the island's railway network to the Russian gauge. The conversion was completed in 2019.