Metro do Porto has chosen a consortium made up of Portugal's Alberto Couto Alves and two Spanish contractors, FCC Construction and Contratas y Ventas, to build a EUR380 million (US$404.7 million) 6.4 km Ruby line (Line H) for the Porto metro in Portugal .

The Ruby Line will run from Casa da Música, in the heart of Porto, to Santo Ovídio, in the neighboring municipality of Gaia. The line will interchange with six other Metro lines at Casa da Música, as well as with the Yellow Line at Santo Ovídio. The route will comprise eight stations and traverse the Douro River using the Antónia Adelaide Ferreira Bridge, a newly constructed structure designed for public transport, pedestrians, and cyclists. This project involves the establishment of eight additional stations, the construction of two tunnels, and the development of a new bridge spanning the Douro River. Currently, the network consists of six lines, covering a total of 67 km and serving 82 stations. Additionally, infrastructure for the future connection to high-speed rail lines will be established in Santo Ovídio.

Construction is set to begin by the end of 2023, with the new infrastructure anticipated to become operational in 2026.