An electric train is a type of train that runs on electricity instead of steam or diesel. It is also known as an electric locomotive, electric railway, or electric bullet train. In some contexts, it may be called a tram, streetcar, or light rail vehicle. The term "electric train" is often used interchangeably with "subway" or "metro," especially in urban areas where such systems are common. Other synonyms for electric train include Rapid Transit System, Mass Transit Railway, and Heavy Metro. Regardless of the name, electric trains are an efficient and eco-friendly transportation option that continues to be popular worldwide.