The aim is to reduce dependency on highways.
Brazil's federal public ministry recommended suspending the sale of the electric power firm's distribution subsidiary in Amazonas state.
BNamericas spoke with the CEO of the Chinese-Chilean consortium that presented the project about the recent uncertainty surrounding the train and its significance for the country.
Some of the country's main highways were blocked by demonstrators during the protests.
Smaller players become more relevant as major conglomerates lose out due to their role in corruption scandals.