For over a century, Laos had exactly one railway. It was seven kilometers long, built on two river islands, and its primary purpose was to carry disassembled gunboats around a waterfall. The Don Det-Don Khon railway, threading across the Si Phan Don -- the "Four Thousand Islands" archipelago in the Mekong -- was one of colonial engineering's stranger improvisations: a solution born from the French Empire's refusal to accept that a river could not be conquered.
The French colonial administration was obsessed with the Mekong as a trade route into China, and with countering British expansion in Upper Burma. The governor of Indochina envisioned the river as the connective thread linking Cochin-China, Cambodia, Laos, and Tonkin. But in southern Laos, the Mekong fractures into dozens of channels around the Siphandon Islands, dropping over the Khone Phapheng Falls -- Southeast Asia's widest waterfall. Between 1891 and 1893, the French tried to force steamships up the falls by brute effort. Accounts describe vessels with "engines roaring and boilers near bursting, with hundreds of men hauling from the rocks on ropes and others pushing from the decks with pikes." One ship reportedly wriggled up a narrow water-slide to within fifty meters of the top before the attempt was abandoned. The river had won.
The alternative was ingenious and slightly absurd. In 1893, the year Laos became part of French Indochina, engineers laid a narrow-gauge railway across Don Khon island. The concept was portage at industrial scale: specially designed vessels would be dismantled, loaded onto railcars, hauled across the island, reassembled on the other side, and launched upstream. For its first four years, the track was temporary -- segments were lifted after the train passed and relaid ahead of it, a crawling, improvised affair. Vietnamese laborers hauled the wagons by hand. By 1897, a permanent track was in place and a wood-burning steam locomotive named Paul Doumer, after the Governor-General of French Indochina, replaced human muscle. Equipment came from the French firm Decauville via Cochinchina. Trains ran with a maximum of twelve cars, and it took an average of two trains to load a single vessel.
Because the reassembled vessels could only travel when the Mekong was in flood, the railway's usefulness was seasonal. During the 1910s, the French extended the line three kilometers north across a bridge to the island of Don Det, where it terminated at a pier near Ban Khon. A 170-meter concrete viaduct connected the two islands. Marthe Bassenne, a physician's wife who traveled between Phnom Penh and Luang Prabang in 1910, left one of the few firsthand accounts of the journey. The gun-sloops Lagrandiere, Ham Luong, and Massie were among the first vessels to cross the island by rail, followed by the Garcerie, Colombert, and Trentinian in 1896. The Trentinian met an inglorious end decades later, sinking after a gasoline explosion in 1928. The outbreak of the Second World War apparently sealed the railway's fate. The last train reportedly ran in 1940.
Today, the railway's trackbed remains largely intact and can be walked or cycled, though the rails themselves have long been removed. The compacted ballast and sand path is now the main route across the islands for backpackers who arrive by boat from Nakasang on Route 13. At a former maintenance depot in Ban Khon sits the only steam locomotive still in existence in Laos -- a rusty engine named Eloise, built in 1911 by the German manufacturer Orenstein and Koppel. She rests on a short stretch of track, raised onto a concrete plinth to keep her wheels above the floodwaters, sheltered under a shed built to slow her deterioration. Goats have been photographed lounging on her frame. She is Laos's entire railway heritage, condensed into a single corroding machine on a river island.
In 2005, the Vientiane Times reported a possible reopening of the railway for tourism, with a budget estimated at 1.5 million US dollars. A memorandum of understanding was signed with a South Korean construction company, but the firm backed out. By then, highway improvements and airport development had eroded any practical need for Mekong freight transport in Laos. The country's real railway era began elsewhere -- in 2009, when a short line opened between Thailand and the Thanaleng station near Vientiane, and more dramatically in 2021 with the Chinese-built Vientiane-Boten high-speed rail link. The Don Det-Don Khon railway remains what it always was: an artifact of colonial ambition, stranded beautifully in the middle of a river.
Located at approximately 13.96N, 105.92E in the Si Phan Don (Four Thousand Islands) region of the Mekong River in southern Laos, Champasak Province. From altitude, the Mekong fragments into a braided network of channels around hundreds of islands -- the archipelago is unmistakable. The Khone Phapheng Falls are visible to the south. Nearest airport is Pakse International Airport (VLPS), roughly 130 km to the north. The islands of Don Det and Don Khon are connected by a bridge visible at lower altitudes, with the old railway trackbed tracing a line across both islands.