CP Pipes Starlink Satellite Wi-Fi Into an Alfa Pendular Trainset — Low-Orbit Antennas Carry 19% of Onboard Traffic in a Pilot to Plug Mobile-Network Dead Zones

Portugal's national railway operator, CP (Comboios de Portugal), has begun testing Starlink — the low-earth-orbit satellite internet service operated by Elon Musk's SpaceX — as a way to deliver reliable Wi-Fi to passengers on its flagship Alfa Pendular trains.

The pilot has equipped a single Alfa Pendular trainset with satellite antennas that work alongside the conventional mobile-network systems already used for onboard connectivity. The idea is straightforward: where terrestrial 4G and 5G coverage falters — in tunnels, river valleys and the sparsely served interior — the satellite link picks up the slack.

Early results suggest the approach is working. During testing, the satellite connection has accounted for roughly 19% of total onboard data traffic, a share that CP says is "particularly relevant on route sections where terrestrial mobile networks show lower performance." In other words, nearly one in five megabytes consumed by passengers is already arriving from space on the stretches where the ground network is weakest.

The Alfa Pendular is Portugal's fastest and most premium service, linking Lisbon and Porto with Braga to the north and Faro in the Algarve to the south. Patchy Wi-Fi has long been one of the most common complaints from business travellers and tourists who expect to work or stream for the duration of a multi-hour journey, and the line's mix of dense urban corridors and remote countryside makes consistent coverage genuinely difficult to engineer with cellular technology alone.

The Minister of Infrastructure and Housing, Miguel Pinto Luz, cast the trial as part of a broader modernisation of the rail network, predicting that "stable, reliable, high-quality Wi-Fi throughout the journey will become a reality." CP, for its part, describes the pilot as a step toward a more comfortable and connected travel experience designed to make the train a more attractive alternative to the car and the plane.

The project also slots into a wider European trend. Rail operators in several countries have begun trialling low-orbit satellite connectivity as the constellations have matured, betting that the technology can finally solve the decades-old problem of keeping passengers online at speed. For Portugal, where the government is pushing rail as a lower-carbon backbone of national mobility, on-board connectivity is as much about competitiveness as comfort.

For now, the deployment remains experimental, confined to one trainset while CP gathers technical and operational data. No investment figure or timetable for a full roll-out across the fleet has been disclosed. But if the satellite link continues to carry a meaningful slice of traffic on the hardest stretches of track, the case for extending it to the rest of the Alfa Pendular service — and perhaps beyond — will be hard to resist.