As part of the Istanbul Metropolitan Municipality's goal of expanding the size of the city's rail transportation network to 1,023 km (636 mi) by the end of the 2020s, the Istanbul Metro has several lines that, as of 2018, are under construction or planned. Since the city does not have a widespread railway network, the Metropolitan Municipality aims to connect urban areas of the city that do not have access the Istanbul's two coastal railways with metro lines.