A direct connection for cross-platform interchange is provided between the platforms for Zona Universitària (L3) and Badalona – Pompeu Fabra (L2).

The two sections were unified, with L3b converted to overhead electrification, in June 1982, and the L3b platforms were used for train storage.

In 1996, line L2 was extended from Sant Antoni, reusing the erstwhile L3b platforms as the L2's terminus.

[2][3] Future plans are for L2 to be diverted at Sant Antoni, via an interchange with L3 at Poble Sec, to Barcelona Airport.

This diversion will render the section of L2 from Sant Antoni to Paral·lel, and the L2 terminal tracks at Paral·lel, redundant.