The story
Line 1 of the subway built in Porto Alegre was started in 1980, linking the center of Porto Alegre to cities to the north of the metropolitan area, as Canoas, Esteio, Sapucaia do Sul, São Leopoldo and Novo Hamburgo. The route was selected to relieve the heavy traffic of highway BR-116, the only option before the construction of this line, which already had serious problems with transit at the time.
The Line 1 was inaugurated on March 2, 1985, between the Central Public Market and Sapucaia do Sul, covering a route of 27 kilometers (16.8 mi) and 15 stations.
Extensions
In December 1997, the line was extended to Unisinos. A 3.8-kilometer (2.4 mi) extension to São Leopoldo-Museum was added in November 2000, after two months of trial service.
A further 9.3-kilometer (5.8 mi) extension to Novo Hamburgo opened in two phases: a 4.9-kilometer (3.0 mi), two station stretch opened in July 2012, followed by the final 4.4-kilometer (2.7 mi), three station stretch on December 21, 2013.
From Wikipedia’s article on Porto Alegre Metro, shared under CC BY-SA 4.0.4