CP trials Starlink internet on Alfa Pendular trains

Portugal’s state rail operator CP has launched a pilot project using Starlink satellite technology on one of its Alfa Pendular high speed trains, aiming to strengthen on-board Wi-Fi on long distance services where mobile coverage is weakest.

Satellite pilot targets dead zones on flagship route

Publicly available information from CP shows that the trial equips a single Alfa Pendular unit with satellite connectivity based on Starlink technology, operating alongside the train’s existing mobile network equipment. The focus is to maintain a more stable connection in areas of the national rail network where terrestrial mobile signals are patchy or frequently interrupted.

The Alfa Pendular is CP’s premium tilting train service, introduced in 1999, linking cities including Braga, Porto, Lisbon and Faro at speeds of up to 220 km/h. On-board Wi-Fi has long been promoted as a core feature, but passengers often report service drops as trains cross river valleys, tunnels and sparsely populated stretches of the Linha do Norte and other corridors.

The new pilot is designed as a live test in commercial service rather than a laboratory trial. By running the system on a regular timetable, CP can observe how satellite connectivity behaves under real passenger loads and in varying weather and topographical conditions.

According to recent specialist rail coverage, early test results suggest that the Starlink link has already been carrying a significant share of total data traffic on the equipped train, particularly in sections where mobile performance is poorer. That pattern supports CP’s view that satellite connectivity could act as a complementary layer rather than a wholesale replacement for ground networks.

How Starlink fits into CP’s existing Wi-Fi system

Technically, the project uses Starlink as an additional backhaul option feeding the train’s internal Wi-Fi network. Alfa Pendular trains already rely on a multi-operator cellular setup, aggregating signals from national mobile networks and distributing the connection through on-board access points installed in each carriage.

In the pilot configuration, the Starlink antenna installed on the train roof establishes a high bandwidth link with low earth orbit satellites, which then route traffic to ground stations connected to the wider internet. A control system on board selects between available links, aiming to keep latency low and throughput high for passengers moving between carriages.

This hybrid approach reflects a broader trend in European rail, where operators combine 4G and 5G with satellite links to address persistent coverage gaps along long distance routes. For CP, the Starlink test is also an opportunity to evaluate integration challenges, such as antenna placement on tilting rolling stock and maintaining a stable connection at high speed and on curves.

For passengers, the technical complexity is largely invisible. If the pilot performs as expected, the main difference for everyday users should be fewer interruptions to streaming, video calls and cloud-based work sessions during journeys across Portugal.

Passenger experience at the center of connectivity push

CP has spent the past decade refurbishing its Alfa Pendular fleet to keep the product competitive on the busy Lisbon–Porto axis and on north–south services to the Algarve. The trains offer reclining seats, individual power sockets, a bar car and accessibility features, reflecting their role as the operator’s flagship service.

Improved digital connectivity is emerging as a key part of that upgrade strategy. Studies by Portugal’s communications regulator in previous years highlighted gaps in mobile signal quality on intercity rail corridors, and customer feedback on social platforms has frequently pointed to inconsistent on-board Wi-Fi performance.

By trialling satellite internet, CP is responding to growing expectations that trains should offer a travel experience comparable to fixed broadband or high quality mobile connections on major highways. Work and leisure travellers increasingly rely on uninterrupted connectivity for remote meetings, entertainment and trip planning while on the move.

Rail commentators note that more reliable Wi-Fi could also strengthen the competitiveness of long distance trains against short haul flights and private cars, especially on core routes where journey times already approach three hours between Portugal’s main urban centers.

Potential expansion and implications for Portugal’s rail network

The current Starlink trial is limited to a single Alfa Pendular trainset, and CP has not publicly committed to a full fleet rollout. The operator is instead collecting operational and technical indicators during the test phase, including stability, coverage improvements and passenger usage patterns.

If the results are positive and the cost structure proves sustainable, observers expect CP to consider extending the technology to the remainder of the Alfa Pendular fleet and potentially to Intercidades services. Such an expansion would require further investment, as roof space, power supply and integration with existing communications equipment vary between train types.

The pilot coincides with broader modernization efforts in Portugal’s rail sector, including new rolling stock orders and planned infrastructure upgrades on main lines. Integrating resilient connectivity solutions at this stage could help future proof services as higher capacity and potentially higher speed operations are introduced in the coming years.

For international travelers, the move adds Portugal to the growing list of countries where long distance trains are experimenting with low earth orbit satellite connectivity. While the immediate impact is confined to one train, the Alfa Pendular trial offers an early indication of how satellite internet might support a more connected travel experience across the country’s rail network.

What travelers can expect in the coming months

During the pilot period, CP has indicated through public communications that the aim is to avoid disruption to existing services while quietly monitoring performance in daily operation. Passengers using the equipped Alfa Pendular train will access Wi-Fi in the usual way, without needing to distinguish between satellite and mobile sourced connectivity.

Travel industry observers suggest that any noticeable differences are likely to appear on segments traditionally associated with weak coverage, where fewer disconnections or faster page loads may be evident at busy times. However, results may vary day to day as the system is fine tuned and as external factors such as network congestion and weather come into play.

For now, travelers planning journeys between northern and southern Portugal can expect the familiar Alfa Pendular product, with the added possibility of more consistent online access on one of the circulating trainsets. Further details about long term deployment, if confirmed, are expected to emerge only after CP has completed its evaluation of the Starlink pilot data.