Premetro

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 line 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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