Bullet trains, also known as shinkansen in Japan, are high-speed passenger trains that can reach speeds over 300 km/h. The document discusses bullet trains in India, comparing them to conventional trains. Key points are that bullet trains have no friction or engine, requiring less maintenance and fuel. India's first bullet train will connect Mumbai to Ahmedabad, helping modernize Indian railways. It is expected to halve travel time and provide economic and environmental benefits over conventional trains.