Line 3 (Rio de Janeiro)

The plan to build a subway line connecting Rio de Janeiro to its sister municipality, Niterói, has existed since at least 1968.^[1] In the 1968 plan, it was estimated that hte line would've been built by 1990.^[1] However, that deadline was never met.

Throughout the following years, many more promises were made – and subsequently not kept – by a multitude of governors of Rio de Janeiro regarding the construction of Line 3:

• In 2002, the project was divided into two parts: part 1, with a length of 6 kilometres (3.7 mi), extending underneath Guanabara Bay from Carioca Station (Rio de Janeiro) to Arariboia Station [pt] (Niterói); and part 2, with a length of roughly 21 kilometres (13 mi), extending from Arariboia Station [pt] (Niterói) to Guaxindiba (São Gonçalo), with segments above ground.^[2][3]

• In 2006, a seminar called "Rio de Janeiro on Rails – Subway Line 3" (Portuguese: Rio de Janeiro nos Trilhos – Linha 3 do Metrô) was held by the Brazilian Association of the Railway Industry (Portuguese: Associação Brasileira da Indústria Ferroviária, shortened as ABIFER) to discuss the implementation of the project of Line 3.^[4]

• In 2011, the Brazilian Ministry of Works announced that construction on the line would begin that year for a 2014 opening.^[5] The line would feature an existing 23 kilometres (14 mi) suburban rail alignment in Niterói, São Gonçalo and Itaboraí being upgraded to metro standard, and a 4 kilometres (2.5 mi) tunnel under Guanabara Bay to Rio de Janeiro.^[6] Federal funds for the construction, totalling R$ 1.2 billion, were initially intended to be granted in 2012, but were barred by Congress in late 2011.^[7]

• In September 2013, governor Sérgio Cabral and president Dilma Rousseff announced a partnership between the federal and state governments, with the goal of collecting R$ 2.57 billion in total to be put towards the construction of Line 3.^[8]

• In October 2014, governor Pezão stated his intent in starting the construction of Line 3 before the end of the year.^[9] Eight months later, in June 2015, Pezão explained that the state's government didn't have the necessary funds to build it, which had an estimated cost of R$ 3.9 billion.^[10] The Director Plan of Urban Transportation of 2015 (Portuguese: Plano Diretor de Transportes Urbanos) estimated that construction of its many projects should be done by 2036, but that it would be ideal for them to be finished by 2021.^[11]

• In July 2019, governor Wilson Witzel guaranteed that, during his administration, the construction of Line 3 would begin.^[12] Six months later, in January 2020, Witzel stated that the administration was considering whether building more boat stations would be more effective than building Line 3.^[13]