Metrô de São Paulo, Line 4, Brazil “ ” Since May 2010, the metropolis of São Paulo, Brazil, has boasted Latin America’s most innovating metro line. All trains of the new Line 4 - ‘the yellow line’ - have air-con and ambient sound. More groundbreaking are the glass partitions separating the platform from the tracks, for improved traveler safety and comfort, and the driverless technology: the trains use computerized technology, instead of a conduct

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