Maglev (magnetic levitation) trains are technically viable and currently operate in several countries, but their economic viability remains a major hurdle due to staggering construction costs. Unlike traditional high-speed rail, Maglev requires entirely new, specialized guideways that cannot share tracks with existing trains. In 2026, the world’s most famous system is the Shanghai Maglev, which reaches 431 km/h (268 mph). Japan is currently building the Chūō Shinkansen, a superconducting Maglev line between Tokyo and Nagoya estimated to cost over $80 billion; its viability is supported by the extreme passenger density of that corridor. While the "initial capital expenditure" is massive, Maglev trains are often cheaper to maintain in the long run because they have no moving parts in contact with the track, eliminating mechanical wear and friction. They are best suited for ultra-high-density corridors where the time savings (up to 600 km/h or 373 mph) can justify the multi-billion dollar investment, but for most regions, standard high-speed rail remains the more "economically viable" choice.