ABSTRACT

The tram–train concept consists of the operation of a light rail system that can run either on existing or new tramway tracks, or on existing railway tracks, so that the services of urban public transport can be extended towards the region over these existing railway tracks, with much lower costs than if a completely new line were built.

The authors have developed a research project about the feasibility of such a system in Madrid (Spain), extending newly created light rail networks through local Renfe (National Railways) lines, or through the Metrosur line (a circular metro line of new construction in the south of the city).

The aim of the paper is to explain the conclusions of this research project in relation to the main technical issues that must be solved to develop this system.

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