Among its various customers, Inter Electric boasts Seoul Metro, which is not only one of the most representative public institutions in South Korea, as it is the company that manages the metro network in the capital and surrounding areas, but also aims to develop urban transport and improving public well-being. The Seoul subway has 22 operating lines and 707 stations, including the Korail lines (Korea Railroad Corporation – the most important South Korean railway company) and those for commuter traffic. It includes 537.4 km of metro lines and is a total of 1131.5 km long including suburban railways. The Seoul metropolitan system is one of the most used urban transport systems in the world, with over eight million daily journeys. The network serves Seoul, Incheon, Gyeonggi-do, the north of Chungcheongnam-do and the western part of Gangwon-do.