Premetro

Trams at Saint-Gilles/Sint-Gillis station with partially low platforms in Brussels.
Low platform section for trams at Duisburg Hauptbahnhof Stadtbahn station.
Low platform station for trams in Vienna during transformation. A third rail and emergency stairs from the future high platform have already been installed.
Pantano station before conversion.

Premetro (or pre-metro) is a type of light rail designed for eventual conversion to a full rapid transit (also known as a metro). These systems typically include infrastructure such as tunnels, viaducts, and dedicated rights-of-way to separate them from other traffic, built to metro standards with wider curves and gentler gradients than conventional light rail lines. However, they often include sections without full segregation, limiting immediate conversion. Premetros are usually operated with light rail vehicles or trams until an upgrade is implemented.

Several cities have referred to portions of their light rail networks as a pre-metro, including Brussels and Antwerp. Additionally, Buenos Aires has a light rail line named Premetro, however this operates as a feeder line to the metro network, and was not built with plans for conversion to full rapid transit.

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