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..but it reached saturation a few years ago. Now they are attempting to convert parts of it into lightrail. Buses have their limits as well as their appeal to a broad demographic. It turns out Curitiba's system worked well until its denizens started turning middle class.
If a (western) city thinks it can get away with a few cheap bus upgrades without simultaneously building serious PT (rail based) then it will discover the hard way it ain't true.