The streetcar (tranvía) at the beginning of the 20th century can be considered a predecessor of the current Medellín Metro.

[4] The railway history of Colombia and Antioquia has not been indifferent to the industrialization process that started at the end of the 19th century and that only has been restrained by the social and political conflicts of this South American nation.

The Antioquia Department, and the Paisa Region in general, owe their progress to the construction of railways that put them in direct contact with the rest of the country (especially with Bogotá, Cali and the Colombian Caribbean Littoral).

The city's speedy urban growth, especially since the 1960s, has filled the entire Aburrá Valley and made towns touch its borders: Bello, Copacabana, Girardota, Barbosa, Envigado, Itagüí, San Antonio de Prado, La Estrella, Sabaneta and Caldas, among others.

The city grew due to big waves of migrants coming from the Colombian countryside looking for refuge from internal political conflict.

The Medellín Metro was created not only as a massive urban transport solution for the working class residents of the city, but also as an important cultural symbol that would help develop marginalized sectors.

In 1979, research on economic and technical possibilities began, performed by the company Mott, Hay and Anderson Ltd.

The line starts in the Acevedo Station and goes to the up hill district of Santo Domingo Savio.

The line starts in the San Javier Station and goes through Juan XXIII and Vallejuelos to the La Aurora district.

The reason for constructing this line is because the city wants to promote tourism in the rural area near Lake Guarne.