Analysis of information sources in references of the Wikipedia article "Premetro" in English language version.
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This step-by-step planning approach to building rail rapid transit is known as pre-metro, implying the intention to ultimately construct a fully grade separated route to be used by rail rapid transit or metro trains.
pre-metro — a light rail transit system designed with provisions for easy conversion to heavy rail (rail rapid transit).
Premetros also allow a gradual upgrade of existing tramways to rapid transit, thus spreading the investments costs over time.
Pre-Metro is an extreme case of light rail, on segregated right of way, and designed to upgrading to metro when passenger demand increases sufficiently.
But instead of building the entire expensive systems immediately, the Germans hit on the idea of building only the city centre tunnels at first. Intended in the long run to be extended to full undergrounds, in the short term they could be used by trams which would continue to run on the surface outside city centres. The idea spread to other European countries, especially Belgium, where it became known as pre-metro. Today Brussels, Frankfurt, Stuttgart and many other cities are filling their central business districts with construction sites to move the trains underground.
PREMETRO—An LRT system designed with provisions for easy conversion into RRT (metro).
Cities such as Frankfurt and Cologne in West Germany have further developed their tramway system by introducing a concept known as "premetro." In this system trams or light rail vehicles make extensive use of tunnels, reserve track and by utilizing folding steps these vehicles can operate through high or low stopping places.
the outer tracks of the Tremont Street Tunnel which was adapted to elevated train use in 1901 by the construction of higher platforms
{{cite book}}: CS1 maint: location missing publisher (link)Un semi-métro peut constituer une étape intermédiaire vers la constitution d'un véritable métro lorsqu'il est envisagé d'étendre par phases successives le site propre intégral à la totalité de la ligne ou du réseau. Les ouvrages sont alors dimensionnés au gabarit du futur métro et on parle du pré-métro.
pre-metro: a light rail transit system designed with provisions for easy conversion to rail rapid transit
Antwerpen rail network is a typical premetro network.
{{cite web}}: |last= has generic name (help)PREMETRO—An LRT system designed with provisions for easy conversion into RRT (metro).