(December 1972). "The semi-metro plan for Den Haag". The Modern Tramway. 35 (35): 404. Retrieved 22 March 2023. "Sistema deMetroLigeiro do Porto". Retrieved
private railways, the state-owned Comboios de Portugal (CP) and its predecessor, the municipal Metropolitano Ligeirode Mirandela and the two private transport
duplicar e Lisboa estuda "novas linhas demetroligeiro". Amadora - Sta. Apolónia pode ser a primeira". Mensagem de Lisboa (in European Portuguese). Retrieved
Stadtbahn in Germany, premetros in Belgium, sneltram in the Netherlands, trem ligeiro in Portugal and fast trams in some other countries. The introduction of
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