Getting ahead of the Summer Olympics in Rio that starts on August fifth, Apple has just added Rio de Janeiro their transit map app, according to MacRumors. Other major cities that Apple's transit maps cover can be found here. Apple acquired transit mapping companies Locationary and Embark back in 2013. Apple's first granted patent relating to mass transit was awarded back in November 2015.
The report notes that Rio's "Transit directions are available for travel by bus, ferry, metro, and train throughout the Rio de Janeiro metropolitan area, including connections to and from Belford Roxo, Duque de Caxias, Itaboraí, Japeri, Magé, Mesquita, Nilópolis, Niterói, Nova Iguaçu, Queimados, São Gonçalo, and São João de Meriti."