Vactrain
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A vactrain is a proposed design for very-high-speed rail transportation. It is a maglev line using partly evacuated tubes or tunnels. Reduced air resistance could permit vactrains to travel at very high (hypersonic) 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.
An image of a proposed system of the Hyperloop system
Maglev
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Maglev is a system of rail transport whose rolling stock is levitated by electromagnets rather than rolled on wheels, eliminating rolling resistance.
Transrapid 09 at the Emsland test facility in Lower Saxony, Germany
Example of low-speed urban maglev system, Linimo
The Birmingham International Maglev shuttle
Transrapid at the Emsland test facility