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The highest railway in the world crosses 960 kilometers above 4,000 meters in altitude and reaches a maximum point of 5,072 meters — where the air has 40% less oxygen and passengers rely on pressurized systems to breathe
Inaugurated in July 2006, the Qinghai-Tibet railway is the highest railway in the world. According to Wikipedia, the section between Golmud and Lhasa stretches for 1,142 kilometers, of which more than 960 kilometers run above 4,000 meters in altitude — a region where the air contains 40% less oxygen than at sea level.
Moreover, the highest point of the line is at the Tanggula Pass, at 5,072 meters above sea level. To put it into perspective, this altitude is higher than the summit of Mont Blanc, the highest mountain in Western Europe.
Therefore, each train journey between Xining and Lhasa is literally a mountain climb — but sitting in a seat with oxygen coming from the walls.
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Why the carriages need oxygen — and how the system works
As detailed by China Tibet Train, each train that travels the highest railway in the world has two independent oxygen supply systems.
The first system automatically increases the oxygen level inside the carriages when the train enters the plateau zone above 3,000 meters. In practice, the carriages function like pressurized airplane cabins — maintaining an artificially breathable atmosphere.
Secondly, each seat has an individual oxygen outlet that passengers can use if they feel symptoms of altitude sickness, such as headache, dizziness, or nausea.
Furthermore, the temperature control system keeps the carriages warm even when the outside temperature plummets to -45°C on winter nights in the Tibetan plateau.
Thus, the engineering of the train transformed what would be a lethal journey for most people into a relatively comfortable experience.
The highest railway in the world runs 550 km over permafrost — how to build tracks on melting frozen ground
Indeed, the biggest technical challenge of the highest railway in the world was not the altitude itself, but the ground on which the tracks needed to be built. According to Chinese engineers, 550 kilometers of the line run over permafrost — permanently frozen ground that becomes unstable when heated.
Consequently, if the tracks were supported directly on the ground, the heat from the train itself and the stations could melt the permafrost and cause the railway to sink.
In this regard, engineers developed creative solutions. In some sections, they elevated the line over viaducts so that cold air could circulate freely beneath the tracks. In others, they installed cooling tubes in the ground to maintain a stable temperature.
The most ingenious method uses natural convection: vertical tubes filled with liquid ammonia capture the winter cold and store it underground during the summer, keeping the ground temperature below zero even in the hottest months.
In comparison, the construction of a high-speed railway in the United States faces bureaucratic obstacles. The Tibetan railway faced obstacles from physics itself.
The ghost station: Tanggula is at 5,068 meters and has no staff
Still, perhaps the most surprising fact about the highest railway is the Tanggula station. Located at 5,068 meters in altitude, it is the highest railway station in the world.
The station operates automatically, with sensors and cameras remotely controlled from operation centers at lower altitudes.
However, the station has no permanent staff. Especially because the extreme conditions — intense cold, strong winds, and lack of oxygen — make continuous human presence unfeasible.
Similarly, very few trains stop at Tanggula. Most just pass through the station at reduced speed while passengers observe the lunar landscape of the plateau through the window.
To understand the isolation, the nearest town to the station is more than 100 kilometers away by dirt roads.
Despite this, local Tibetan residents live in the area around the station, genetically adapted to altitudes that would incapacitate most people.
Tunnels at record altitude: drilling through mountains at 4,648 meters
In addition to the open-air tracks, the line includes impressive tunnels. The Fenghuoshan Tunnel is the highest railway tunnel in permafrost in the world. Meanwhile, the Kunlun Mountain Tunnel is 1,686 meters long and is at 4,648 meters altitude — the longest tunnel in permafrost on the planet.
Equally challenging is the engineering of bridges and viaducts along the route. More than 675 bridges distribute the weight of the trains without disturbing the fragile ecosystem of the plateau.
On the other hand, engineers had to deal with frequent earthquakes in the region, winds of up to 150 km/h, and sandstorms that reduce visibility to almost zero.
46 years of construction — from the first failed attempt to the world record
According to historical data, the construction of the railway began in 1958 with the section between Xining and Golmud, completed only in 1984 — 26 years later. However, the most difficult section, between Golmud and Lhasa, only began construction in 2001.
More than 100,000 workers participated in the construction during the five years of work on the Golmud-Lhasa section. Many carried portable oxygen cylinders while working.
In practice, China took 46 years from the first excavation to the full inauguration of the line in 2006. The total cost reached $4.2 billion — a modest amount for a project of this scale.
The project involved the construction of 675 bridges and 7 tunnels, as well as 45 stations distributed along the route.
In summary, the highest railway in the world cost less than a single subway station in cities like New York or London.
Today, more than 1 million passengers and 8 million tons of cargo travel the line annually, connecting isolated Tibet to the rest of China.
Could the same engineering that tamed the Tibetan permafrost be applied to similar challenges in the Arctic, where melting permafrost threatens entire infrastructures?
Finally, the Qinghai-Tibet railway proves that human engineering can conquer even the most extreme conditions on the planet. However, it also reminds us that, at 5,072 meters in altitude, it is not the train that needs help to breathe — it is the people inside it.
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