Key takeaways
- The prefix carries the information: BB and CC describe a locomotive's wheel arrangement, Z and X the electric or diesel-powered railcar respectively.
- France runs on two electrification systems – 1.5 kV DC in the south and west, 25 kV AC in the north, east and on all high-speed lines.
- TGV inOui, Ouigo, Intercités and TER are brands, not companies. Everything is run by SNCF Voyageurs.
- The network and stations are separate companies – SNCF Réseau and SNCF Gares & Connexions belong to the group but don't run trains.
- TER colours belong to the region, not to SNCF. A train that doesn't look like SNCF can still be run by it.
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.The prefix decides, not the number
- 8.One group, many brands, few companies
- 9.The electrification boundary and what it means
- 10.What’s different for German spotters
- 11.When SNCF is written on it, and who’s really running it
- 12.Verdict
- 13.Frequently asked questions
Fact file
| Legal form | State-owned public limited company, restructured as a group with independent subsidiaries since 2020 |
|---|---|
| Role in the system | Group parent – passenger services, the network and stations are separate companies |
| Electrification systems | 1.5 kV DC in the south and west, 25 kV / 50 Hz in the north, east and on all LGV lines |
| Track gauge | 1435 mm standard gauge |
| Infrastructure | SNCF Réseau – network and path allocation |
| Stations | SNCF Gares & Connexions as a separate company |
| Vehicle system | Letter prefix for wheel arrangement and drive type, followed by the class number |
| Regional services | TER on behalf of the regions, Transilien in the greater Paris area |
| Official website | www.sncf.com |
Business areas
Structure & brands
History at a glance
How to recognise SNCF
Does the train really belong to SNCF?
- Letter prefix ahead of the number – BB, CC, Z, X, B or Y appear on the vehicle
- TGV trainset with two power cars and low-slung articulated cars in between
- Regional TER colour schemes – each region sets its own livery
- Country code F in the data panel ahead of the vehicle keeper marking
- Overhead line varies – the design of the catenary distinguishes DC and AC areas
- Corail carriages – the classic long-distance carriages are still in service in many places
- Late platform announcements at the Parisian terminus stations as an operational hallmark
Strengths and weaknesses
What the company stands for
- The prefix system places any vehicle in seconds, without you needing to know the type
- The largest route network in Western Europe with very different regions
- Two electrification systems mean system-changeover stations with locomotive changes
- TER vehicles in regional colours make identification visually varied
- Border stations such as Modane bundle international traffic at one point
Where it falls short
- Access barriers are increasingly appearing on Parisian long-distance platforms
- Photography is occasionally stopped by security staff
- The brands tell you nothing about the operating company
- Regional TER liveries make it harder to link a train to the group
- Platform information appears at terminus stations only shortly before departure – planning becomes difficult
Updated: August 2026 – On a French locomotive there isn’t simply a number. Ahead of it stand two letters – BB or CC – and they tell you straight away how many axles are powered. SNCF classifies its vehicles by design, not by purpose. Anyone who can read this prefix has found their way into the largest railway world in Western Europe.
Grasp prefix and number together
"22200" alone is ambiguous. Only with the BB in front does it become a reliable sighting.
The prefix decides, not the number
France names its vehicles after their technical design. The prefix comes first, the number follows – and both belong together in your logbook.
| Prefix | Meaning | Example | What you’re looking at |
|---|---|---|---|
| BB | two two-axle powered bogies | BB 22200 | four-axle main-line locomotive |
| CC | two three-axle powered bogies | CC classes | six-axle machine for heavy trains |
| Z | electric railcar | Z 50000 | suburban train in the greater Paris area |
| X | diesel railcar | X 73500 | regional train without overhead line |
| B | bi-mode railcar | B 82500 | regional train for both modes of operation |
| Y | shunting tractor | Y 8000 | small locomotive for station and works duty |
With the classic locomotive families, the number block also tells you which electrification system a machine was built for: the 7200 series ran under DC, the 15000 series under AC, the 22200 series under both. That’s not a universal rule, but a pattern that often helps you in everyday spotting.
One group, many brands, few companies
Since the conversion into a public limited company, SNCF has consisted of independent subsidiaries. All passenger services sit within a single one of them. The network belongs to SNCF Réseau, the stations to another group company.
What you see on the train, on the other hand, is almost always a brand: TGV inOui for standard long-distance services, Ouigo for the low-cost offering, Intercités for state-commissioned long-distance connections, TER for regional services, Transilien for Paris suburban services. None of these is its own company. Add stakes such as Eurostar for the international level – and via Transdev, French capital is also present in German regional services.
TER colours belong to the region, not the railway
In regional services the regions commission the trains and set the livery. The same vehicle design therefore runs red on one side and blue on the other. A train that doesn't look like SNCF at all is still run by SNCF Voyageurs – colour is even more worthless in France than elsewhere.
The electrification boundary and what it means
The south and west run on 1.5 kV DC, the north and east on 25 kV at 50 Hz. All high-speed lines were built with AC. Because the dividing line runs across the country, dual-system locomotives are an everyday sight in France rather than an exception.
The difference is already visible in the overhead line: DC sections need considerably heavier catenary at low voltage. Anyone who watches for this often spots the system changeover before they see the first change of vehicle. At Modane towards Italy, the Italian system is added on top.
Read the prefix
BB, CC, Z, X, B or Y. That gives you design and drive type in one step.
Note the number block
Four or five digits. With the classic locomotive families it hints at the electrification system.
Record the brand separately
TGV inOui, Ouigo, Intercités, TER or Transilien belong in the field for the product, not the operator.
Look for the data panel
Country code F plus vehicle keeper marking. That's the only entry that really tells you the keeper.
Note down station and platform
At the Parisian terminus stations, the point of the compass determines which vehicles are even in play.
How long is your journey to the spot?
Approximate values: roughly 250 km/h on the LGV, roughly 110 km/h on classic lines.
Build a France tour around the terminus stations
Other people's sightings show you which vehicles actually turn up at which Parisian station.
What’s different for German spotters
The gauge matches, but plenty else feels unfamiliar. Besides the two electrification systems, the station structure stands out above all: Paris has no through station, but several terminus stations, each of which serves one point of the compass. At Gare de Lyon you therefore see a completely different range of vehicles than at Gare du Nord.
Add to that the operational style: platform information appears at the terminus stations only shortly before departure, which makes spontaneous positioning harder. Some long-distance platforms have access barriers. And the overall security climate is stricter – staff approach people taking photographs more often than in Germany. Outside Paris this relaxes considerably, for instance at Lyon Part-Dieu or Marseille Saint-Charles.
When SNCF is written on it, and who’s really running it
It's SNCF Voyageurs when …
- the data panel shows F and an SNCF vehicle keeper marking
- the train runs under one of the SNCF brands
- the prefix matches a known SNCF design
Look more closely when …
- a TER runs in a regional special livery with no SNCF reference
- an international train runs under its own brand
- a freight locomotive runs in a foreign livery
It's not SNCF when …
- the data panel shows a foreign vehicle keeper marking
- the train belongs to a private freight operator
- it's a vehicle of a foreign railway passing through
Anyone looking for the classic carriage world still finds it in France: Corail carriages keep running in many places, and a substantial share of today’s fleet comes from Alstom.
Take security staff seriously
In French stations, photography is questioned more often than in Germany. Don't argue – explain briefly and step back if asked to. Don't photograph control systems or security installations; the general rules are set out in the article on safety distance at the track.
Verdict
France is large, technically diverse, and for spotters both welcoming and awkward at the same time. The prefix system is the best news: five letters, and you can classify any vehicle without knowing the type.
The worse news is the brand cascade. TGV inOui, Ouigo, Intercités, TER, Transilien – none of them tells you an operator. Anyone who wants to document France cleanly notes brand and keeper separately and, in the end, relies on the data panel.
Bottom line
In France the vehicle information sits in the prefix, the operator information in the data panel – and neither sits in the brand on the side of the train.
Record brand and keeper separately
That way your France sighting stays correct even once the next brand is introduced.
Summary
- France classifies vehicles by design rather than by purpose – the prefix is the fastest way into any identification.
- The group consists of separate companies; the brand on the side of the train tells you nothing about the operator.
- The dividing line between the two electrification systems is the operationally most interesting part of the network.
- There's no through station in Paris: every point of the compass has its own terminus with its own vehicle world.
Frequently asked questions
What do BB or CC mean before a French locomotive number?
The letters describe the wheel arrangement. BB stands for two two-axle powered bogies, CC for two three-axle bogies. A BB 22200 is therefore a four-axle main-line locomotive, a CC a six-axle machine. The system is old and is still used today – it tells you more about the vehicle than any class number alone.
What do Z, X and B stand for?
Z denotes an electric railcar, X a diesel railcar and B a bi-mode vehicle that can run under overhead line and on non-electrified lines. Add Y for shunting tractors such as the Y 8000. With these five letters you can classify practically any French vehicle.
Which electrification systems does France have?
Two. The south and west run on 1.5 kV DC, the north and east on 25 kV at 50 Hz. All high-speed lines were built with AC. The dividing line runs across the country, which is why dual-system locomotives such as the BB 22200 play such a large role in everyday French operation.
Is the TGV its own company?
No. TGV was originally a vehicle design and today is above all a brand name. Services are run by SNCF Voyageurs, with different brands for the standard and low-cost offerings. There are separate companies and stakes for international traffic, such as Eurostar – so the vehicle alone doesn't tell you who is running the train.
Why do TER trains look different in every region?
Because regional services are commissioned by the regions, and they set the livery. The same vehicle design therefore runs in one colour scheme in one region and a completely different one in the neighbouring region. A train that doesn't look like SNCF at all is still run by SNCF Voyageurs – verifiable only through the data panel.
Who operates the French route network?
SNCF Réseau. The company belongs to the group but is legally independent and doesn't run any trains itself. Stations are managed by another group company. This three-way split into services, network and stations is why "SNCF" is practically never a sufficient answer to the question of who operates something.
Why doesn't Paris have a main station?
Because the network historically grew out of several private companies, each of which built its own terminus. Every point of the compass therefore has its own station with its own vehicle world: Gare de Lyon for the south-east, Gare du Nord for the north and international traffic. A through station for long-distance services still doesn't exist today.
Can I get to the long-distance platforms in France?
Usually yes, but not everywhere. At some Parisian long-distance platforms there are access barriers that require a valid ticket. On top of that comes an overall stricter security climate: staff occasionally approach people taking photographs. Stay on public areas and don't photograph security installations – the basic rules are set out in the article on house rules at stations.
Where can I see international traffic in France?
At the border stations. Modane is the classic crossing towards Italy, with a system changeover and corresponding change of locomotive. Strasbourg bundles traffic towards Germany, and at Gare du Nord in Paris, traffic from Belgium, the Netherlands and Great Britain converges.
Does SNCF also run freight?
Yes, within the group, though after a fundamental restructuring: the former freight division was reorganised into new companies due to state-aid conditions. Alongside it, numerous private freight operators run on the French network. How resilient the current split is is difficult to judge publicly – when in doubt, only the data panel helps.
Log vehicles from SNCF
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
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 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.
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.
GroupTransdev
Transdev is a French mobility group that operates bus, tram, metro and rail services in several countries – almost always under local brands rather than its own name. In its home market of France, of all places, it wasn't allowed to run passenger trains for decades.
Related guides from the blog
- Tracking trains live across Europe: a country guide for cross-border travellers
- Interrail for railfans: planning a European tour with a camera
- Spotting Border Stations: Where Foreign Trains Enter Germany
- Planning a Spotting Tour: One Day, Several Stations, Maximum Haul
- Who's Actually Running That Train? How to Identify Railway Operators
