semi-metro
tramway which includes segments in tunnels or viaducts
Green Line
MBTA subway/light rail line
The Hague semi-metro
Light rail system in The Hague, The Netherlands
Muni Metro
light rail system in San Francisco, California, United States
Vienna Pre-metro
system of tunnels used by Vienna's tram and tram-train lines
Metro do Porto
light rail system in Porto, Portugal