A map from 1970, somenine years before the Metro opened, showing what the network was meant to look like in 1990. As things have turned out, not quite.

Although the initial segment and the “Linha Prioritária” correspond very closely to the current Metro Line 1, and parts of the dashed “Linha 1” on the map correspond somewhat to the current Line 2, the remainder is very different indeed. A crossing to Niteroi on the other side of Guanabara Bay? An extension from Saens Peña out to Jacarepagua, and an orbital line from there to Penha? And the Metro in 2019 only has 41 stations compared to the projected 54… a very different future!

Source: National Archives of Brazil/Flickr