Bullet trains were invented in 1964 in Japan and travel up to three times faster than conventional trains. They use superconducting magnets to levitate above the track using little to no energy. The first bullet train, the Shinkansen, had three classes and could carry 731 passengers. Bullet trains are more environmentally friendly than conventional trains due to less friction, noise, and no fossil fuel usage. India's first bullet train will connect Mumbai to Ahmedabad and is estimated to cost $15 billion, with Japan financing 81% of the project through a low-interest loan.