Curitiba, in Brazil, is known for the pioneering deployment of Bus Rapid Transit (BRT) in the 1970s, and its system became a reference model worldwide. However, from its very beginning, Curitiba's BRT competed with rail projects, from subway to light rail vehicles (VLT). These projects have been defended by many municipal technicians over the years as better solutions for urban transportation. From 1952, when the last tram ran in the city, up to 2009, when the municipality concluded a bid for a new subway project, eight projects were developed as attempts to resume rail transportation in town. In spite of the failure of all those projects, this article proposes that the major innovations in the BRT in Curitiba had their origins in those unimplemented rail projects, through technical and political advances that resulted from controversies, conflicts, and alliances among the main relevant social groups and artifacts involved during this period.

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