Experience a train ride like no other - where carriages that rattle high in the sky are pressurised like planes. Branded a 'miracle' of engineering, the The Qinghai - Tibet Railway is a £3.3 billion project that connected cut-off Tibet to the rest of

Also known as the Sky Train, the railway opened to the public in 2007, linking Golmud in with Lhasa, the capital of Tibet Autonomous Region. Medical facilities and oxygen-making stations were made along the route so construction workers could plough ahead with the line without having to deal with altitude sickness.

Why? Because most of the 1,956km line sits at a staggering 4,000m above sea level (13,123 ft) - with the highest point reaching a stomach-churning 16,640 ft. Passenger cabins come with oxygen masks that are available to queazy tourists unable to hack the dizzying heights as they zoom through the 'roof of the '.

If you can stand the height, the Qinghai-Tibet Railway offers stunning views like no other. You'll leave the soaring skyscrapers behind and melt into vast countryside, rugged snow-capped mountains and impressive glacier; you may even spot the odd cow looking up from the ground, confused by the 'flying' train.

On TripAdvisor, swathes of travellers hailed the unique journey - even if it did leave them feeling a little faint. "It was a nice experience with lots of beautiful scenery," one person raved. "I did feel a bit of headache and short of breath sometime along the way but there's oxygen onboard."

Another agreed, commenting: "The first half of the trip... [the] natural view along the way totally amazed me. After half of the trip, during the night, I experienced high altitude sickness. It was terrible. But that amazing view I saw beat my sickness," while a third added: "The scenery outside the window is really breathtaking. It is a good way to go to Lhasa as it gives the body some time to adjust to the high altitude."

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"The rail journey officially starts from , capital of Qinghai province, and ends in , capital of Tibet," travel experts over at Lonely Planet explained. "From start to end, the trip takes only one day (20 hours 55 minutes to be exact), and there are trains plying the same route every day. It is possible to make stops along the journey, but this is not a spontaneous hop-on/hop-off affair."

Unlike UK trains, you won't have to break the bank to have a go on this monster of a route. There are three types of tickets available, ranging from soft sleeper cabins (which consist of four beds, a TV and luggage console) to a more budget-friendly bog-standard seat. The latter will only set you back ¥360 (which is roughly £1.80).

Would you dare to venture on the Qinghai - Tibet Railway? Let us know in the comments section below