Semi-metro

Semi-metro (also known as subway-surface line or hybrid streetcar/light rail line) is a form of public rail transport in which trams run partly on a conflict-free track, by using tunnels and/or viaducts. These stretches of track are designed to function like a regular metro or rapid transit line. Semi-metro lines run with tram cars because they are usually developed from an existing tram network.
One key difference with metro/rapid transit is that semi-metro lines only partially run in tunnels and/or on viaducts. A metro line has an entirely conflict-free track, often completely grade separated. Semi-metro routes are operated by regular trams (with or without low floor) or with specially developed streetcars/tramcars (light rail vehicles), such as the Stadtbahn-car 'type B'.
== Examples ==
*Muni Metro - San Francisco
Category:Rail transportation