U-4 (Metro line)

The U-4 is a deep-level Metro service in operated by MetroNewisle. The service runs east to west between at Hawthorne in The Capitol and Foothills in the West Side. It is one of the few Metro lines that travels at the same elevation throughout its entire journey. The U-4 is also the first line to have note-block alert systems to announce arriving trains, implemented at all stations on 19 June 2021.