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News Story Source: https://www.nextbigfuture.com
Having super-high speed trains travel in vacuum or very low pressure is an idea that has been around for centuries and the maglev vacuum concept has been around for decades.
A maglev (magnetic levitation) line would use partly or fully evacuated tubes or tunnels. Reduced air resistance could permit vactrains to travel at very high speeds with relatively little power—up to 6,400–8,000 km/h (4,000–5,000 mph). This is 5–6 times the speed of sound in Earth's atmosphere at sea level.
China has slashed air pressure in a test track tube to as low as 2.9 centibars, or 2.9 kilopascal units of pressure, in experiments on the 6-meter-diameter test run at a maximum speed of 50 kilometers per hour. Standard atmosphere pressure is 101.325 kilopascals. The pressure is 33 times lower than normal air pressure.
Standard sea-level pressure, by definition, equals 760 mm (29.92 inches) of mercury, 14.70 pounds per square inch, 1013.25 dynes per square centimeter, 1,013.
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