Semi-metro

Subclass of light rail using rapid transit infrastructure.

Semi-metro is a form of public rail transport in which trams run partly on a conflict-free track, by using tunnels and 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.

This keyword could refer to multiple things. Here are some suggestions: