Key takeaways
- Adif is an infrastructure company and runs no passenger or freight trains itself – the tracks belong to it, the trains don't.
- Spain runs two gauges in parallel: Iberian broad gauge on the conventional network, standard gauge on the high-speed lines.
- Adif Alta Velocidad is a separate company – the high-speed lines are organisationally not tied to the same body as the older lines.
- Adif's house rules apply at the station, not the train operator's. The infrastructure manager decides on access and rules.
- Several operators run on the same tracks since high-speed services were opened up – a train tells you nothing about the infrastructure manager.
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.An infrastructure manager without trains
- 8.Two gauges, two electrification systems, one manager
- 9.Whoever owns the track decides on access
- 10.How to work out a Spanish station situation
- 11.When Adif belongs in a sighting
- 12.Conclusion
- 13.Frequently asked questions
Fact file
| Legal form | a state-owned company (entidad pública empresarial) owned by the Spanish state |
|---|---|
| Role in the system | railway infrastructure manager (EIU) – tracks, signalling, stations; no train operations |
| Origin | created in 2005 by splitting the former RENFE into infrastructure and operations |
| Second company | Adif Alta Velocidad – a separate entity for the high-speed network since 2013 |
| Gauges in the network | 1668 mm Iberian broad gauge, 1435 mm standard gauge, plus metre gauge in the north |
| Electrification systems | 3 kV DC on the conventional network, 25 kV 50 Hz on the high-speed lines |
| Stations | Adif operates the passenger stations – its house rules apply there, not the train operator's |
| Relevant for spotters | access, platform rules and photography permission depend on Adif, not on Renfe |
| Official website | www.adif.es |
Business areas
Structure & brands
History at a glance
How to recognise Adif
Does the train really belong to Adif?
- No Adif vehicle in passenger service – anyone looking for an Adif logo on a train looks in vain
- Adif lettering is found on station buildings, platform edges and switchgear cabinets, not on locomotives
- Engineering, measuring and maintenance vehicles run in conspicuous warning colours and often carry Adif markings
- The gauge beneath the train reveals which part of the network you're on: broad gauge means the conventional network, standard gauge means a high-speed line
- At gauge-change facilities and system-changeover points, both gauges lie visibly side by side
- Platform supervision, announcements and access controls at stations trace back to Adif staff
Strengths and weaknesses
What the company stands for
- A clear split: once you know the infrastructure manager, it's immediately clear why several operators in Spain use the same tracks
- Large stations are well developed and offer long, manageable platforms
- The two gauges make vehicle identification easier than it first appears
- Several operators on the same lines increase the variety of vehicles at a single spot
Where it falls short
- At the large long-distance stations there are access controls – spontaneous platform spotting isn't a given there
- Adif itself is practically invisible on the vehicle, so it hardly ever appears correctly in sighting logs
- The split between Adif and Adif Alta Velocidad is hard to follow from the outside
- Different figures circulate for network size and line lengths – reliable numbers don't belong in any sighting note
- Construction states and line assignments change without being well documented publicly
Updated: August 2026 – In Spain, two gauges lie side by side, and both belong to the same organisation. Adif manages the conventional broad-gauge network, the standard-gauge high-speed network, and metre-gauge lines in the north too – without running a single passenger train itself. Anyone who wants to make sense of Spanish sightings has to separate these two levels first.
File Spanish sightings correctly
Note network part, gauge and operator separately – the Traintrack app keeps both in one entry.
An infrastructure manager without trains
The most important sentence first: Adif is a railway infrastructure manager. It owns the tracks, points, signalling, signal boxes, overhead lines and passenger stations. It owns no passenger coaches, no line locomotives and no licence to run services.
This split isn’t a Spanish peculiarity, it’s a European rule. Whoever owns the network isn’t allowed to gain an advantage for their own train operations from it. That’s why the old RENFE was split up in 2005: infrastructure to Adif, operations to Renfe. You’ll find the same pattern with SNCF Réseau in France and with RFI in Italy.
Two gauges, two electrification systems, one manager
Spain’s older network was built in broad gauge. When high-speed lines were built from the 1990s onward, European standard gauge was deliberately chosen – with its own electrification system to go with it. The result is a country where two technically separate networks lie side by side and meet at defined points.
| Feature | Conventional network | High-speed network | Narrow-gauge network in the north |
|---|---|---|---|
| Gauge | 1668 mm broad gauge | 1435 mm standard gauge | 1000 mm metre gauge |
| Electrification | mostly 3 kV DC | 25 kV 50 Hz AC | DC, lower values |
| Typical services | regional, local and freight | long-distance, several operators | regional services, tourist trains |
| Manager | Adif | Adif Alta Velocidad | Adif |
For you at the trackside, the gauge is therefore no side issue, but the fastest way to identify where you are. It tells you in a single second which of the three systems you’re standing in – and with it, which vehicle families are even possible. Vehicles with variable-gauge axles, as made famous by Talgo, are the exception that proves the rule.
Network first, then vehicle
For Spanish sightings, always note first which part of the network you're standing on. A standard-gauge high-speed train and a broad-gauge regional railcar can be at the same station and still belong to entirely separate technical worlds. The vehicle number in the data panel sorts out the rest – how to read it is covered in the guide to the UIC number.
Whoever owns the track decides on access
This is where the infrastructure manager becomes practically relevant for spotters. Adif runs not only the line but also the station. That puts the house rules with the infrastructure manager, not with the company whose train happens to be pulling in.
At large long-distance stations such as Madrid Puerta de Atocha, there’s the added factor that the platform area isn’t freely accessible. Anyone wanting to photograph there spontaneously simply won’t get in. At regional stations the situation is more relaxed – but responsibility stays the same. What house rules at a station generally mean is covered in the article on house rules at stations.
The track area is off limits, no matter who owns it
Operational sites, tracks and platform ends are not photo spots. That applies regardless of which company is the owner, and is enforced consistently in many countries. What's at risk if you trespass is described in the article on trespassing on the tracks; the distance rules are explained in safe distance from the track.
Record infrastructure manager and train operator separately
That way your sighting stays correct even when the operator landscape changes.
How to work out a Spanish station situation
Check the gauge
A look at the track bed separates broad gauge from standard gauge. That settles whether you're on the older or the new-build network.
Read the platform area
Access controls and separate halls point to the long-distance part. Freely accessible platforms mostly belong to regional and local services.
Read the operator from the vehicle
The name on the side is a brand. Only the data panel names the keeper and vehicle number.
Don't note Adif as the operator
Adif belongs in the field for infrastructure, never in the field for the operating company. This mix-up is the most common error in Spanish sighting logs.
Document uncertainty
What you haven't read with confidence, mark as a guess. An honest gap can be filled in later, a wrong assignment rarely can.
Is what you've noted down enough?
Gauge and number together carry the biggest share – everything else is context.
When Adif belongs in a sighting
Name Adif when …
- you're describing a line, a station or a facility
- it's about access, platform rules or house rules
- you're documenting an engineering, measuring or maintenance vehicle
Look closer when …
- a vehicle in warning colours is running with no recognisable operator
- both gauges lie side by side at a system-changeover point
- a train is standing on a part of the network it doesn't technically fit
Adif doesn't belong when …
- you're assigning a passenger or freight train to an operator
- a livery or brand needs to be identified
- it's about a timetable, train number or transport service
The reason for this split is practical, not formal: operators change. If another company takes over a route tomorrow, Adif stays the owner of the track. A sighting that keeps both cleanly separate survives every change in the market. How to build a searchable archive from this is described in the guide to keeping a sighting log.
Conclusion
For spotters, Adif isn’t a subject, it’s an ordering principle. The company explains why two gauges exist in parallel in Spain, why several providers run on the same high-speed lines, and why house rules at a station don’t lie with the company whose logo is passing by right now.
Anyone who notes network part and vehicle separately has got the hardest part of Spanish sightings behind them. The rest is patience on the platform – for instance at Barcelona Sants, where all the levels come together in one place.
In short
Adif owns Spain's tracks and stations, but runs no train. For the sighting, what counts is the operator in the data panel; Adif, by contrast, explains gauge, access and house rules.
An archive that survives changes of operator
Record network, vehicle and place separately – so every sighting stays useable for good.
Summary
- Anyone who wants to understand Adif has to stop looking for Adif trains: the company is visible in the track bed and the station building, not on the side of a vehicle.
- The country's dual-gauge system isn't a curiosity, it's the most important ordering principle for any Spanish sighting.
- Since long-distance services were opened up, several operators share the same infrastructure – infrastructure manager and train operator permanently diverge.
- Most important in practice: at Spanish long-distance stations, Adif decides on access and behaviour on the platform.
Frequently asked questions
Does Adif run its own trains?
No. Adif is a railway infrastructure manager: it owns and operates tracks, points, signalling and stations, but has no licence as a train operator. Everything that runs on Spanish tracks belongs to another operator. The exception is engineering, measuring and maintenance vehicles, which serve the network itself and don't appear in passenger service.
What's the difference between Adif and Renfe?
Both emerged from the same predecessor organisation in 2005. Adif got the infrastructure, Renfe got the operations. Adif sells train paths, Renfe buys them. That's why Renfe can run on a line it doesn't own – and why other companies can use the same line too.
Why does Spain have two gauges?
The conventional network was historically built in Iberian broad gauge at 1668 mm. When high-speed lines were built from the 1990s onward, they were built in European standard gauge at 1435 mm, to link up with the rest of the European network. Both systems have existed side by side ever since, connected via gauge-change facilities and vehicles with variable-gauge axles.
What is Adif Alta Velocidad?
An independent company that has run the standard-gauge high-speed network since 2013. It was separated out mainly for financial and regulatory reasons. On the platform, that changes little for you – for understanding the structure, it matters a lot: the older and newer networks are tied to different bodies, even though both trade under the Adif name.
Am I allowed to photograph at Spanish stations?
As a general rule: the station operator exercises the house rules, and that's Adif here. At larger long-distance stations there are also access controls to the platform area. The legal starting point differs from country to country; the general principles are explained in the article on house rules at stations. If in doubt: ask, don't just try it.
Who else runs on Adif tracks besides Renfe?
Since high-speed services were opened up, several providers share the same lines. Among those involved are offshoots of the French and Italian state railway groups – structures that also stand behind Trenitalia and SNCF. Freight services from several companies come on top of that. The infrastructure manager remains Adif in every case.
Do the stations belong to Adif too?
Yes, the passenger stations are operated by Adif. That's more than a formality: platform access, supervision, announcements and house rules lie with the infrastructure manager, not with the company whose train is currently pulling in. At Madrid Puerta de Atocha you notice that more clearly than at a small country station.
How do I tell which part of the network I'm standing on?
Most reliably by the gauge and by the vehicles. Broad gauge with classic local and long-distance trains means the conventional network. Standard gauge with high-speed trains means a new-build line. At gauge-changeover points both lie side by side, letting you compare the difference directly.
Does Adif also manage the narrow-gauge lines in the north?
Yes. After the former narrow-gauge operator FEVE was dissolved in the early 2010s, its infrastructure passed to Adif. That means a single company manages metre gauge, broad gauge and standard gauge. There's no reliable, permanently valid public figure on the current extent of this part of the network – only the responsibility is reliable.
Where in Spain can I see the most operators at once?
At the large terminus stations. Barcelona Sants brings together long-distance, regional and high-speed services in one place. For cross-border traffic, Portbou on the French border is worthwhile, where system changeover and gauge change become directly visible.
Log vehicles from Adif
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.
Typical vehicles
Where you will find Adif
Spotting locations where you will regularly come across vehicles from this organisation – with viewpoints, the best light and coordinates.
Madrid Puerta de Atocha
Atocha is two stations in one: a listed hall where palm trees have stood instead of trains since the nineties, and next to it the modern high-speed station with access control. Knowing which part is freely accessible saves you a lot of hassle here.
Junction stationBarcelona Sants
Barcelona Sants brings together all of Catalonia's long-distance and commuter traffic – and does it entirely underground. No daylight, no train shed, but standard and broad gauge side by side and a connection through to France. Knowing that in advance changes how you plan.
Border stationPortbou
Portbou was built for a job that no longer exists: switching between Iberian broad gauge and French standard gauge. Since international traffic took the new high-speed line further inland, a monumental hall stands here over very little activity.
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.
InfrastructureSNCF Réseau
SNCF Réseau manages France's rail network, from branch lines to the LGV high-speed lines – and runs not a single train itself. Anyone spotting in France constantly runs into this split: track, station and train belong to three different companies within the same group.
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
- Property Rights at the Station: Where You May Stand and Where You May Not
- Walking on Railway Tracks: What Penalty You Face and Why It Can Be Fatal
- Safety Distance at the Track: The Rules That Save Lives
- Reading the UIC number: what the 12 digits on a vehicle reveal
- Are you allowed to photograph trains? The complete legal and practical guide for trainspotters (2026)
