Key takeaways
- 1668 mm Iberian broad gauge sets Portugal technically apart from the rest of Europe – only Spain shares this measurement.
- CP no longer runs any freight trains. The division was sold in 2015 and is now called MEDWAY.
- The network belongs to Infraestruturas de Portugal, a company that's also responsible for roads.
- Alfa Pendular, Intercidades, Urbanos are product brands of the same company, not separate companies.
- Two electrification systems and one metre-gauge line make CP more technically varied than the network's size suggests.
Contents
- 1.Fact file
- 2.Business areas
- 3.Structure & brands
- 4.History at a glance
- 5.How to recognise the company
- 6.Strengths and weaknesses
- 7.A technical island with one neighbour
- 8.Three network worlds in one company
- 9.What a German railfan has to learn afresh here
- 10.Where to go in Portugal
- 11.CP or not CP?
- 12.Verdict
- 13.Frequently asked questions
Fact file
| Legal form | Public company owned by the Portuguese state |
|---|---|
| Role in the system | Passenger services across the whole network – from suburban trains to tilting trains |
| Track gauge | 1668 mm Iberian broad gauge, plus one remaining metre-gauge line |
| Electrification system | 25 kV 50 Hz on the main network, 1500 V DC on the suburban line to Cascais |
| Infrastructure | sits with Infraestruturas de Portugal – road and rail in one company |
| Freight | no longer its own business area; the division was sold in 2015 and is now called MEDWAY |
| Long-distance brand | Alfa Pendular – tilting trains on the Lisbon–Porto axis and towards the Algarve |
| UIC country code | 94 for Portugal, written out as PT on the data panel |
| Official website | www.cp.pt |
Business areas
Structure & brands
History at a glance
How to recognise Comboios de Portugal (CP)
Does the train really belong to Comboios de Portugal (CP)?
- Wide vehicles on wide track – the Iberian gauge is visibly wider than 1435 mm to the naked eye
- Alfa Pendular on the display means the fastest train in the country, with tilting technology
- Intercidades stands for classic locomotive-hauled long-distance services
- Urbanos marks the suburban networks of Lisbon and Porto with their own vehicle world
- On the line to Cascais, trains run under 1500 V DC and are tied to that line
- Freight locomotives never carry CP colours – they belong to MEDWAY or other companies
- The country code on the data panel reads PT
Strengths and weaknesses
What the company stands for
- A self-contained vehicle world you see nowhere in Central Europe
- Two large hub stations cover a substantial share of the traffic
- Platforms are mostly freely accessible and easy to survey
- The metre-gauge line offers a subject that no longer exists anywhere else in the country
- Suburban networks offer a dense frequency and so a predictable yield
Where it falls short
- No vehicle variety from foreign operators – the gauge rules them out
- Few cross-border connections, so foreign vehicles are correspondingly rare
- Away from the main axes the frequency is thin and the journey demanding
- CP no longer runs any freight – if you're after that, you have to follow other companies
- Reliable information on the vehicle classification system is hard to come by
Updated: August 2026 – Anyone standing on a Portuguese platform for the first time notices the difference before they can name it: the track is wider. Comboios de Portugal runs on 1668 millimetres of Iberian broad gauge, 233 millimetres more than European standard gauge. That one figure explains almost everything that makes the country special for railfans – and some of it isn’t convenient.
Record vehicles you'd otherwise never see
Portugal's fleet runs nowhere else. Note the series, number and location while you're standing in front of it.
A technical island with one neighbour
The Iberian gauge is shared by Portugal with only one country, Spain, where Renfe runs on the Adif network. To the north and east, that ends any direct vehicle movement: whatever runs in France, Germany or Italy can’t run here. For you that means an unusual experience – over the course of days you see nothing but vehicles from a single railway world.
That cuts both ways. The vehicle variety from foreign operators that makes every border station interesting in Central Europe is completely absent. In exchange, every single sighting is something that appears nowhere else on your list. The manufacturer landscape is its own world too: vehicles for the Iberian gauge often come from Spanish builders such as CAF or Talgo, which has made a name for itself among other things with gauge-changing trains.
Three network worlds in one company
Portugal’s network is smaller than Germany’s, but far from technically uniform. Within the same company, CP serves sections with different gauges and different power supplies.
| Part of network | Gauge | Electrification system | What you see there |
|---|---|---|---|
| Main network | 1668 mm | 25 kV 50 Hz | Alfa Pendular, Intercidades, regional trains |
| Suburban line to Cascais | 1668 mm | 1500 V DC | its own fleet of multiple units tied to the line |
| Linha do Vouga | 1000 mm | no overhead line | diesel railcars, the country’s last narrow-gauge world |
| Non-electrified branch lines | 1668 mm | no overhead line | diesel railcars in regional service |
| Freight axes to ports and borders | 1668 mm | mixed | trains from MEDWAY and other companies, never from CP |
The last row is the most important. Since 2015, freight no longer belongs to CP: the division was sold and is now called MEDWAY. A freight train in Portugal is therefore automatically not a CP train – a rare piece of clarity that takes the guesswork out of identification for you.
The brand tells you the product, not the company
Alfa Pendular, Intercidades, Regional and Urbanos appear prominently on displays and timetables. All four belong to the same company. They tell you how fast the train is and how often it stops – they say nothing about the operator, because there's barely another one in passenger services. Why brand, keeper and operator can generally diverge is explained in the guide Who's actually running this?.
What a German railfan has to learn afresh here
The gauge is the obvious point, but not the only one.
The electrification system on the main network is 25 kV 50 Hz – so not the Central European 15 kV system, but the same as on new lines in France or in Eastern Europe. The suburban line to Cascais falls completely outside that pattern with its 1500 V DC.
The signage is in Portuguese, and outside the major stations there’s little translation to go with it. Train category and destination are easy enough to read, operational notices less so.
The density of traffic is spread very unevenly. On the suburban networks of Lisbon and Porto, a train runs every few minutes during the day; on the regional lines inland, several hours can pass between two trains. If you want to see both in one day, plan the suburban traffic as a buffer and the branch line by timetable.
For photography the usual rule applies: platforms are accessible, operational facilities are not. Portuguese stations are generally open and unfussy; if you behave discreetly and keep walkways clear, you rarely run into problems. The basic rules are set out in the article on house rules at stations.
Read the train category
Alfa Pendular, Intercidades, Regional or Urbanos – that gives you product and stopping pattern in one step.
Note the vehicle series
It's displayed prominently on the front and side. Copy it as you see it, rather than reconstructing it from memory.
Add the data panel
Country code PT and the full number make the sighting unambiguous – the structure is in the guide to reading UIC numbers.
Note the part of the network
Main network, Cascais line or metre gauge: this detail places the vehicle technically and prevents later mix-ups.
Check your travel plan against the system variety
All four extras lie far apart from each other – plan for several days rather than one weekend.
Where to go in Portugal
Lisbon Santa Apolónia is the classic starting point: long-distance, regional and suburban traffic at one terminus station right on the Tagus. Porto Campanhã is the northern counterpart and the interchange point for everything heading further north.
Both stations give you most of the regular traffic in a single day. The interesting fringe areas – metre gauge, DC line, freight axes – each require a separate trip. If you’re travelling longer in south-western Europe anyway, you’ll find suggestions in the article Interrail for railfans.
A fleet you only see here
With the Traintrack app, your Portuguese sightings land in the same list as all the others.
CP or not CP?
It's CP when …
- the train runs as Alfa Pendular, Intercidades, Regional or Urbanos
- it's a passenger train in Portuguese domestic service
- the vehicle runs on the metre-gauge line in regular service
Look closer when …
- the train is running cross-border traffic into Spain
- coaches and locomotive visibly come from different fleets
- a vehicle runs without a train category but with carriages
It's not CP when …
- it's a freight train
- the train belongs to a private suburban concession
- the vehicle is at home on Spanish tracks
No key table for vehicle series
For Poland or Norway, the vehicle classification system can be explained in a few sentences. That doesn't hold for Portugal: the series designations follow no logic that can be cleanly derived from accessible German-language sources. So copy the number down rather than interpreting it – a wrong attribution is harder to correct than an open gap.
Verdict
Comboios de Portugal is a state railway with a clear scope: passenger services, a single country, a largely self-contained vehicle world. If you’re coming from Central Europe, you have to get used to the lack of international variety – but in exchange you get to see vehicles that appear on no German sighting list.
The practical rule for Portugal is short: a passenger train means CP, a freight train means not CP, and the gauge explains why nothing else arrives here. How to log such observations for the long term is described in the guide to keeping a sighting log.
Short verdict
1668 millimetres make Portugal an island. Within it, CP runs the entire passenger service – and since 2015, not a single freight train any more.
Save your sightings from the Iberian Peninsula
Series, number, location and part of the network – four details that keep your Portugal trip worth analysing.
Summary
- For railfans, Portugal is a closed system: what runs here runs nowhere else except Spain.
- Selling off the freight division has reduced CP to passenger services – a clear division of roles that makes identification easier.
- The suburban line to Cascais and the metre-gauge line are two special worlds within the same company.
- If you only visit Lisbon and Porto, you see most of the traffic – but not the most interesting fringe areas.
Frequently asked questions
Why does Portugal run on 1668 millimetres?
The Iberian gauge dates from the early days of railways on the peninsula and was chosen jointly with Spain. It's 233 millimetres wider than European standard gauge. In practice that means a vehicle from Germany, France or Italy can't run in Portugal without having its gauge changed. That's why the Portuguese vehicle world is so self-contained.
Does CP also run freight trains?
No, not since 2015. The freight division CP Carga was sold and has since operated as MEDWAY. If you see a freight train in Portugal, CP is ruled out as the operator. That's one of the few genuinely unambiguous rules you can apply there.
What is the Alfa Pendular?
The Alfa Pendular is the country's fastest train category and uses tilting technology to allow higher speeds through curves. It mainly connects Lisbon and Porto as well as the south towards the Algarve. It's a product brand of CP, not a separate company – the train is run by the same people as a regional train.
Who owns the tracks in Portugal?
Infraestruturas de Portugal (IP), a state company formed in 2015 by merging the rail and road infrastructure operators. That's a special feature: in most European countries, road and rail are organisationally separate. IP doesn't run any trains itself and allocates paths to CP, MEDWAY and other licensed companies.
Can you travel by train from Portugal to Spain?
Yes, but the service is thin. Both countries share the Iberian gauge, so nothing technical stands in the way – the number of routes is nevertheless small and changes over the years. On the Spanish side, Renfe runs on the Adif network. For planning, rely on current timetable information rather than older figures.
Are there still narrow-gauge railways in Portugal?
One. The Linha do Vouga in the north is the last remaining line with 1000 mm metre gauge operated in regular service. There used to be several such networks; they were closed one after another. For railfans it's a rewarding destination, because a vehicle world exists here that no longer exists anywhere else in the country.
Why does the line to Cascais run on DC?
It was electrified early and independently of the rest of the network, and still runs on 1500 V DC today, while the main network uses 25 kV 50 Hz. The vehicles used there are tied to that line and don't turn up elsewhere. If you want to see them, you have to head specifically to the coastal line west of Lisbon.
How are Portuguese vehicles numbered?
CP uses series numbers displayed prominently on the front and side, alongside the UIC data panel with the country code PT. A complete, reliable breakdown of these series can't be cleanly derived from German-language sources – so we deliberately don't give a key table here. Note the number exactly as it appears on the vehicle, and add the data panel; how to do that is in the guide to reading UIC numbers.
Is Portugal getting a high-speed line?
A connection between Lisbon and Porto has been discussed and planned politically for years. Whether and in what gauge it's eventually built is open – there are no reliable dates, and older reports on this have repeatedly been overtaken by events. We deliberately avoid a statement here that would be wrong in two years.
Where in Portugal do I see the most rail traffic?
At Lisbon Santa Apolónia and Porto Campanhã. Both bring together long-distance, regional and suburban traffic in one place and are easily accessible. If you also want to see the special worlds, plan the Cascais line and the metre-gauge line as separate day trips.
Log vehicles from Comboios de Portugal (CP)
Company, vehicle, location and date logged in seconds – and visible to the community.
The operational level in the railway operator database
Who actually runs the trains, with keeper markings and identifying features on the vehicle.
Where you will find Comboios de Portugal (CP)
Spotting locations where you will regularly come across vehicles from this organisation – with viewpoints, the best light and coordinates.
Lisbon Santa Apolónia
Santa Apolónia is Lisbon's oldest station, and it sits so close to the Tagus that the water almost starts right behind the buffer stops. A terminus station on Iberian broad gauge, with a calm rhythm and light you won't get at any underground station.
Junction stationPorto Campanhã
Campanhã is the station where Porto's long-distance traffic converges – and the starting point for the Douro line, where diesel stock takes over further east. A few minutes away lies São Bento with its azulejo hall, one of Europe's most beautiful terminus stations.
More companies
Renfe
Spain operates three track gauges and two electrification systems side by side – and Renfe runs trains that switch between two of them mid-journey. Once you can tell AVE, Alvia and Cercanías apart, you understand the whole system. A surprise is waiting on the platform, though.
InfrastructureAdif
Adif manages Spain's rail network, stations and signalling – and doesn't run a single train itself. The peculiarity: the conventional network runs on Iberian broad gauge, while the high-speed lines run on standard gauge. Anyone who doesn't separate the two gets almost everything wrong when identifying trains in Spain.
ManufacturerTalgo
Talgo doesn't build trains to the European standard design but to its own idea: short car bodies that rest on single-axle running gear between the cars. Once you understand the principle, you can spot a Talgo at any distance – even when it says ICE on the side.
ManufacturerCAF Construcciones y Auxiliar de Ferrocarriles
CAF is the big Spanish vehicle manufacturer that outside Spain is mostly seen as a tram builder. The Urbos family runs in half of Europe, and the Civity multiple units are now reaching German regional services too. Both have a recognisable style.
Related guides from the blog
- Who's Actually Running That Train? How to Identify Railway Operators
- Reading the UIC number: what the 12 digits on a vehicle reveal
- Interrail for railfans: planning a European tour with a camera
- Keeping a Sighting Logbook: From Scraps of Paper to a Real Database
- Planning Sun Position at a Photo Spot: Light Instead of Luck
