Column By Scott Salmon

RIO DE JANEIRO, BRAZIL - An improvement in Rio’s transportation infrastructure was perhaps the most positive legacy of the Rio 2016 Olympics. Yet, already, one of its most vital components is falling apart.

The transportation legacy of Rio’s Olympics can be understood as a set of ambitious goals: steadily diminished, surreptitiously corrupted, only partially realized, and in some cases simply abandoned. Nevertheless, important components were completed, and they have transformed the city’s public transit system.

The jewel of the city’s revamped transportation infrastructure is undoubtedly MetrôRio where a single line of five . . .

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