The line includes two intermediate stations at Tiradentes and Colombo, the latter situated close to Sete de Setembro station on the 14km Line 1, which opened in June.
Limited free passenger services began following the inauguration and full commercial services will start on February 13.
Line 2 passes through one of the oldest areas of the city and more than 500 archaeological artefacts were uncovered during construction.
A full description of the project can be viewed here.
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