It is situated under Rua Alfredo Allen on the University of Porto campus, from which it takes its name.

Immediately to the north of Pólo Universitário station, the line emerges from its tunnel and continues at street level for the remainder of its route.

[1][2] The central tunnelled section of line D, including Pólo Universitário station, opened on 17 September 2005, with trains initially running from Câmara de Gaia, to the south.

Pólo Universitário was the northern terminus until 31 March 2006, when the line was extended to Hospital de São João.

The line has since been extended from Câmara de Gaia to Vila d’Este.