The Stockholm Metro is a rapid transit system in Stockholm, Sweden. Starting its inaugural journey on October 1, 1950, the Stockholm Metro has grown into a multifunctional network, connecting the heart of the city with its diverse suburbs. Today the system has 100 stations in use, of which 47 are underground and 53 above ground. Consisting of three lines – Blue, Red and Green – the Stockholm Metro extends for approximately 105 kilometres, providing both depth and breadth in its coverage. Beyond its utilitarian purpose, the metro system is an immersive experience, where passengers travel not only through tunnels but through curated spaces that reflect the city's vibrant history and contemporary character. A distinctive feature of the Stockholm Metro is its implementation of Automated Train Operation (ATO), which underlines the city's commitment to technological progress and safety in public transport. As Stockholm continues to grow, the metro's expansion plans are dynamic, aiming to accommodate the city's growing population and further increase the efficiency of the transit network.