subway system

A subway system is an underground or elevated train network designed to transport large numbers of people quickly across a city. It consists of multiple train lines, stations, and tracks, allowing passengers to travel efficiently between different neighborhoods without surface traffic delays. Subways operate on scheduled routes with trains running frequently, often underground or on dedicated tracks separate from other vehicles. They are a key component of urban public transportation, reducing road congestion and providing a reliable, fast, and accessible way for daily commutes and city exploration.