Key takeaways
- SNCF Réseau owns the tracks, not the trains. It's an infrastructure company with no passenger services of its own.
- Stations belong to a separate company – Gares & Connexions, not Réseau. That decides access and house rules.
- France runs two electrification systems: 1.5 kV DC in the south and west, 25 kV AC in the north, east and on the LGV lines.
- Réseau was formed in 2015 from RFF and SNCF's infrastructure divisions – the separation itself dates back to 1997.
- Several companies run on the same tracks since long-distance services were opened up. The network tells you nothing about the operator.
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.Two decades of restructuring in one sentence
- 8.Who’s responsible for what in France
- 9.Who owns the track decides who grants access
- 10.How to plan a spot on the French network
- 11.When Réseau belongs in your notes – and when it doesn’t
- 12.Conclusion
- 13.Frequently asked questions
Fact file
| Legal form | Société anonyme, a subsidiary of the SNCF group holding company |
|---|---|
| Role in the system | Railway infrastructure manager – network, paths, signalling; no train operations |
| Formed | in 2015 from the merger of Réseau Ferré de France, SNCF Infra and network operations management |
| Predecessor | Réseau Ferré de France (RFF), founded in 1997 as a separate network owner |
| Network scope | Classic route network plus the high-speed lines (LGV) |
| Electrification systems | 1.5 kV DC in the south and west, 25 kV 50 Hz in the north, east and on the LGV lines |
| Stations | SNCF Gares & Connexions – a separate company, not Réseau itself |
| Relevant for spotters | Platform access and house rules lie with the station company, not the network manager |
| Official website | www.sncf-reseau.com |
Business areas
Structure & brands
Parent group:SNCF
History at a glance
How to recognise SNCF Réseau
Does the train really belong to SNCF Réseau?
- No Réseau logo on passenger trains – the company doesn't appear on the running train at all
- Yellow engineering and service vehicles often carry infrastructure markings and belong to this side of the business
- The overhead line design gives away the electrification system: lighter catenary in the north, sturdier designs in the DC areas
- Signal types and line equipment clearly distinguish the classic network from the LGV
- Kilometre posts and line signs on the trackbed belong to infrastructure, not the operator
- At the station, you deal with Gares & Connexions, not Réseau – house rules and access sit there
Strengths and weaknesses
What the company stands for
- Clear structure: separate network, station and operations, and you understand French train formations quickly
- Large terminus stations bundle many types of traffic in a single spot
- The two electrification systems are visible on the overhead line and help with geographic orientation
- Border stations show system changes and international vehicles in a tight space
Where it falls short
- The split between Réseau, Gares & Connexions and the operating companies is hard to see through from outside
- Some newly built lines run via concession companies rather than SNCF Réseau itself
- Large stations have access restrictions to certain platform areas
- The network manager is invisible on the vehicle and regularly confused with the operator in sighting logs
- Figures on route lengths and network condition vary widely between sources
Updated: August 2026 – Anyone standing on a platform in France is dealing with three companies at once, without noticing. The track belongs to SNCF Réseau, the station to a station company, the train to an operator. All three carry the same three letters in their name – and yet they aren’t the same thing.
File French sightings correctly
Operator, line and location in one entry – the Traintrack app keeps the layers separate for you.
Two decades of restructuring in one sentence
In 1997, the French network was separated out from the state railway: Réseau Ferré de France took ownership, while SNCF remained the operator and maintainer. This arrangement was cumbersome, because ownership and day-to-day business fell apart. In 2015, both parts were merged into SNCF Réseau, and in 2020 came the conversion into a joint-stock company within the group.
What’s stayed the same through all the restructuring: the company runs no trains. It sells paths to anyone with a licence – including competitors of SNCF. That’s exactly what the EU-wide separation requirement is for. As a result, brands such as Eurostar, which have no organisational connection to the network manager, also run on the same tracks.
Who’s responsible for what in France
The most common confusion comes from several companies carrying the same brand name. The breakdown below helps sort it out:
| Layer | Responsibility | Visible to you as … | In the sighting |
|---|---|---|---|
| SNCF Réseau | tracks, points, signals, paths | trackbed, overhead line, signal box | line description |
| Gares & Connexions | passenger stations | platform, concourse, access rules | location, access note |
| Operating companies | train services | vehicle, train number, crew | operator field |
| Concession companies | individual newly built lines | barely, except via specialist literature | side note on the line |
The practical use of this table: only one row belongs in the operator field. Everything else describes the place, not the train. How to tell the network sections apart on a map is shown in the guide to reading a route map.
The electrification boundary is your best map
France is roughly split in two: south and west on 1.5 kV DC, north and east on 25 kV AC. That boundary explains why certain classes only turn up in one half of the country, and why through long-distance vehicles are almost always dual-system. Know it, and you can predict at an unfamiliar spot what can even run there. The TGV from Alstom is the most obvious example: it was designed from the start to switch between both systems.
Who owns the track decides who grants access
For spotters, the ownership question isn’t theoretical. It determines who has the authority to tell you something on the platform and which rules apply. In France, that responsibility lies with Gares & Connexions at passenger stations, and with SNCF Réseau outside the station.
In practice, that means: a platform is a managed space with house rules. A trackbed between two stations is operational railway land – and nobody without authorisation has any business being there, even briefly.
Operational railway land isn't a photo spot
Track areas, embankments along newly built lines, and access paths to signal boxes are off-limits. In France, this is handled especially strictly on high-speed lines, because there's no reaction time there. Photograph from publicly accessible spots – the article on safe distance from the track covers the basic rules, and trespassing on the track covers the possible consequences.
Work through border stations systematically
System changes, locomotive changes, foreign keepers – record it all in one place.
How to plan a spot on the French network
Identify the network section
Classic line or LGV? On the newly built line you'll see almost exclusively high-speed trains, on the older network the whole range.
Work out the electrification system
The system boundary determines which classes are possible at all. You'll mostly find multi-system vehicles at crossover points and in international services.
Check the types of traffic
Long-distance traffic concentrates on the main axes, freight on its own corridors. A terminus station shows you plenty of passenger traffic and little freight.
Clarify the access situation
Freely accessible platforms, or a controlled area? That decides whether a spot is even workable for you.
Note the operator separately
SNCF Réseau belongs in the location description, the operating company in the operator field. Mixing the two makes the sighting useless later on.
Is this spot worth it?
Border locations beat size: a small crossing station often brings more variety than a large terminus.
When Réseau belongs in your notes – and when it doesn’t
Name SNCF Réseau if …
- you're describing a line, its state of development, or its electrification system
- it's about paths, closures or engineering works
- you're documenting a service or measuring vehicle
Check more closely if …
- a yellow vehicle is running with no identifiable operator
- the line might belong to a concession company
- the station is managed by a separate company
Réseau doesn't belong if …
- you're attributing a passenger or freight train to a company
- a train number or service is being documented
- it's about livery, brand or product name
Stand at Lyon Part-Dieu and within an hour you’ll see several types of traffic and several companies on the same tracks. At Strasbourg, cross-border traffic adds to the mix; at Paris Gare du Nord, international traffic does. The network manager stays the same in both cases – and that’s exactly why it tells you nothing about the sighting.
Conclusion
SNCF Réseau is a company you’ll never photograph and yet constantly need. It explains the electrification boundary, the difference between the older network and the LGV, and the question of who’s in charge on the platform.
For the sighting itself, the same rule applies as everywhere in Europe: the track belongs to one party, the train to another. Note both separately, and your entries will still be usable in ten years – say, when yet another new operator turns up on the same lines.
In short
SNCF Réseau is France's network manager, with no train operations of its own. For the sighting, what counts is the operating company; Réseau, by contrast, explains the electrification system, network section and access situation.
Collect France systematically
From branch lines to the LGV – document every trip with location, time and vehicle number.
Summary
- France's rail system is sorted into three layers: who owns the track, who owns the station, and who runs the train – and those are three different companies.
- The electrification boundary running across the country is the network's most practically useful feature, since it determines which vehicles can run where at all.
- On the platform, you're not dealing with the network manager but with the station company – that's the crucial difference for access questions.
- If you separate network and operations in your sighting log, you won't need to correct your entries after the next round of market opening.
Frequently asked questions
Does SNCF Réseau run trains itself?
No. SNCF Réseau is a railway infrastructure manager: it owns and maintains tracks, points, signals and overhead lines, and allocates paths. Passenger trains are run by SNCF through its operating companies, plus several competitors by now. So companies that aren't part of the group also run on Réseau's tracks.
What was Réseau Ferré de France?
RFF was the owner of the French network from 1997. The setup separated ownership from operations: RFF owned the lines, while SNCF maintained and operated them under contract. In 2015, this split was merged back together – both have sat with SNCF Réseau ever since.
Do French stations belong to SNCF Réseau?
Not directly. The passenger stations are operated by SNCF Gares & Connexions, a separate company that has been assigned to SNCF Réseau since 2020. For you, that's more than a formality: platform access, supervision and house rules lie with this station company. The basic principles are explained in the article on station house rules.
Why does France have two electrification systems?
For historical reasons: the south and west were electrified early with 1.5 kV DC, the north and east later with 25 kV 50 Hz AC. The high-speed lines follow the more modern system. That's why many French locomotives and multiple units are dual-system – without that, through long-distance services simply wouldn't work.
What's the difference between the classic network and an LGV?
An LGV is a purpose-built high-speed line with wide-radius curves, its own train protection system, and no level crossings. It can only be used by vehicles cleared for it. The classic network carries regional, freight and part of the long-distance traffic. Both belong to SNCF Réseau, but operationally behave like two separate systems.
Do other companies run on French tracks too?
Yes. Freight has long been open, and long-distance passenger services have been gradually opening up since the late 2010s. In regional services, the regions award contracts that groups such as Transdev also compete for. The network manager stays the same in every case – the track doesn't change owner, only the train changes company.
Does SNCF Réseau own all French lines?
Not quite. Some newly built lines and special projects run via concession or project companies, which build and operate the line for a fixed period. On top of that, there are port, siding and tourist railways with their own owners. There's no stable public overview of the scope and duration of these arrangements, so we'll leave it here with the fact that they exist.
How can I tell from the track which electrification system I'm in?
By the design of the overhead line and by the vehicles. DC lines need noticeably more copper cross-section and so look more heavily built. More reliable is a look at the vehicles: which classes run there gives away the system – an introduction to that is in the guide to reading a route map.
Where in France can I see the most at once?
At the Paris terminus stations. Paris Gare de Lyon bundles traffic towards the south-east, Paris Gare du Nord the international traffic heading north. If you're after freight and border operations, you're better off at Modane on the Italian border.
Why does SNCF Réseau never show up in my sightings?
Because that field is for the operating company, not the network manager. Réseau belongs in the description of the line or location, not in the operator field. This mix-up is the most common mistake in sighting logs for countries with a clear network split – and France is a textbook example of it.
Log vehicles from SNCF Réseau
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
TGV
The TGV is France's high-speed train: two power cars with a continuous articulated rake in between. Here's how to recognise the design and the individual families.
ClassCorail Driving Trailer (B5uxh)
A coach with a driving cab but no motor: the Corail driving trailer B5uxh turns a locomotive-hauled train into a push-pull set. Here's how to spot it and read its code.
ClassY 8000
Small, diesel-powered, constantly on the move: the Y 8000 is an SNCF shunting tractor. Here's how to read the code and recognise the vehicle in the station throat.
Where you will find SNCF Réseau
Spotting locations where you will regularly come across vehicles from this organisation – with viewpoints, the best light and coordinates.
Paris Gare de Lyon
Gare de Lyon is the gateway to the south: the high-speed lines to Lyon, Marseille and Italy all start here, and at peak times the board shows one departure after another. The price is a terminus station with tight walkways, controlled access and huge crowds.
Junction stationParis Gare du Nord
No station in Europe moves more people. Gare du Nord bundles high-speed traffic to London, Brussels and Amsterdam, dense suburban services and regional traffic towards northern France – and seals off part of it behind border control, an area you can't reach as a spotter.
Junction stationLyon Part-Dieu
Part-Dieu is the only major French station where high-speed trains pass through in close succession instead of turning back. That makes it far more interesting photographically than any Parisian terminus – but it costs you reaction time and patience, because the station has been under rebuilding for years.
Border stationModane
Modane sits a good 1,000 metres up in the Maurienne, just before the Fréjus Tunnel into Italy. This is where the electrification systems change, where locomotives get swapped, and where freight trains stand still for minutes at a time – the rare opposite of a station where everything rushes past.
More companies
SNCF
French vehicles carry a letter prefix ahead of the number, and it's no decoration: BB, CC, Z, X and B name the wheel arrangement and drive type. Add two electrification systems, six Parisian terminus stations, and long-distance services that are almost entirely brands.
ManufacturerAlstom
After taking over Bombardier Transportation, Alstom is Europe's broadest vehicle manufacturer. Diesel railcars, freight locomotives, trams – much of it comes from the same house, recognisable not by the logo but by the platform names and their body styles.
BrandEurostar
Since merging with Thalys, Eurostar has been a brand spanning two operating companies. No transport authority commissions these trains – they run because the route pays for itself. That explains almost everything: the choice of routes, the service frequency, and why the fleet is so small and so expensive.
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.
Related guides from the blog
- Property Rights at the Station: Where You May Stand and Where You May Not
- Reading a Railway Line Map: Kursbuchstrecke, KBS and Operating Points
- Understanding Railway Signals: Hp, Ks, Vr and What They Mean for Spotters
- Spotting Border Stations: Where Foreign Trains Enter Germany
- Safety Distance at the Track: The Rules That Save Lives
