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A vactrain (or vacuum tube train) is a proposed design for very-high-speed rail transportation. It is a maglev (magnetic levitation) 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.[1]
- ^ Joseph Giotta (Narrator), Powderhouse Productions (April 16, 2003). "Transatlantic Tunnel". Extreme Engineering. Discovery Channel. Archived from the original on September 27, 2011.