Short answer: in 2026 there is no European standard for onboard Wi-Fi. The network inside the train is simply a relay to the mobile masts along the track: when the train crosses a dead zone or a tunnel, the Wi-Fi drops, whatever the operator. The safe bets are CFF/SBB in Switzerland (no Wi-Fi of their own, but near-continuous 4G/5G coverage along the tracks), Trenitalia's Frecciarossa and Italo in Italy, Eurostar, Deutsche Bahn's ICE trains (free portal, quality varies by route) and ÖBB's Railjet. The poor performers: many night trains (Nightjet, European Sleeper), Spanish and Polish regional services, and some long-distance bus routes. On the mobile data side, surcharge-free European roaming still applies across the EU/EEA thanks to the "Roam like at Home" regulation, extended to 2032 — but it covers neither Switzerland nor the United Kingdom, two countries crossed by a great many itineraries. The most reliable strategy: download everything before you leave, rely on your own data rather than the train's Wi-Fi, and line up a local eSIM for the Swiss and British legs.
The scene has become a classic of European rail travel: you settle in, open your laptop, connect to the "free Wi-Fi" portal advertised on the window sticker, and the login page spins forever. Twenty minutes later the video call drops, the file won't upload, and the passenger next to you explains that around here, "it never works."
It isn't inevitable, and above all it isn't random. Onboard connectivity follows simple technical rules that are highly predictable once you understand them. Here's the full playbook: what each operator really provides, what European law says about roaming, the known black spots, and how to prepare a journey on which you genuinely have to work.
Why train Wi-Fi almost always disappoints
First, let's kill a misconception: a train does not have "its own" internet. In the vast majority of cases, the onboard router aggregates several SIM cards from different mobile operators, picks up the masts along the track, and redistributes that signal as Wi-Fi through the carriages. The available bandwidth is therefore that of the ground-based mobile network, divided by the number of connected passengers.
Three concrete consequences:
- In a tunnel, nothing gets through — except in equipped tunnels (Gotthard, Lötschberg, the Channel Tunnel partially, where on Eurostar the service is interrupted for part of the crossing).
- At 300 km/h, handover between masts is brutal: the signal is constantly being rebuilt, which explains the micro-dropouts typical of high-speed lines in open countryside.
- Wi-Fi is often throttled on purpose: most operators block video streaming and voice over IP to preserve bandwidth. Wi-Fi that "works" but on which Netflix refuses to start isn't broken — it's enforcing its usage policy.
The practical conclusion is counter-intuitive but solid: your own mobile data is often better than the train's Wi-Fi, because you aren't sharing the bandwidth with 400 people. Onboard Wi-Fi is mainly useful as a backup, or when your data allowance has run out.
Operator by operator: what you'll actually find on board
The strong performers
Switzerland (CFF/SBB). A paradox: SBB doesn't offer conventional Wi-Fi on most of its trains. It made a different, more effective choice: fitting windows with signal-permeable coatings and working with Swisscom, Sunrise and Salt to cover the rail network. The result is 4G/5G almost everywhere, including in a good share of the tunnels. There is also an "SBB Free Wi-Fi" information portal in stations.
Italy (Trenitalia, Italo). The Wi-Fi on the Frecciarossa 1000 and Italo EVO trainsets is among the most robust in Europe on the Milan–Bologna–Florence–Rome–Naples corridor, with an onboard entertainment portal (press, films) that keeps working even when internet access weakens, because the content is stored locally.
Eurostar. Free Wi-Fi in both Standard and Premier, with an onboard media portal. The internet connection is interrupted under the Channel: that's structural, so plan for it.
Austria (ÖBB Railjet). Free Wi-Fi and the "Railnet Regio" portal with local content. Decent on the Vienna–Salzburg–Innsbruck axis.
Germany (Deutsche Bahn). Free Wi-Fi on ICE trains and much of the IC fleet, via the WIFIonICE portal. Quality depends enormously on the section: very good on Frankfurt–Cologne, far more temperamental on lines crossing Thuringia or Mecklenburg.
The cases to watch
France (SNCF). TGV Inoui Wi-Fi is free but has historically been uneven; the portal offers press titles and journey information. On Ouigo, there is no onboard Wi-Fi at all: the low-cost model openly does without it, and your mobile data is the only option. On TER regional trains, it varies region by region.
Spain (Renfe, Ouigo España, Iryo). Renfe offers "PlayRenfe", an onboard entertainment portal (films, series, press) that works without internet access: it's locally stored content, not to be confused with a connection. Web access on board exists on AVE services but remains limited. Cercanías and Media Distancia trains generally offer nothing.
Night trains. This is the weak spot. On ÖBB's Nightjet, Wi-Fi exists on the newest trainsets but stays weak, and overnight routes cross a lot of uncovered territory. On European Sleeper (Brussels–Berlin–Prague, Paris–Hamburg), there is no reliable Wi-Fi: the rolling stock is old and leased. On Spanish, Italian or Nordic night trains, assume by default that there will be nothing usable.
Long-distance buses. FlixBus advertises free Wi-Fi on most of its fleet, as does BlaBlaCar Bus, but bandwidth shared by 60 passengers over a motorway 4G network is enough for messaging, not for a video call. USB sockets and sometimes 230 V outlets, on the other hand, are almost universal — which makes the bus a good environment for working offline. A pair of noise-cancelling headphones radically changes the experience over eight hours of motorway.
Roaming: what you're entitled to use, and where it stops
Since 2017, the European regulation known as "Roam like at Home" has abolished roaming charges within the European Union. The text was revised in 2022 and extended to 30 June 2032, with two useful improvements: the obligation to provide the same network quality abroad as at home (if your plan includes 5G in France, you must get 5G in Italy where the local network allows it) and free access to 112 and emergency services.
Key points, in order of importance for a rail traveller:
| Territory | Roaming included in an EU plan? | What to plan for |
|---|---|---|
| EU + Iceland, Liechtenstein, Norway | Yes | Nothing |
| Switzerland | No (outside EU/EEA) | Local eSIM or operator add-on |
| United Kingdom | No since Brexit | eSIM or add-on; some operators still include it |
| Andorra, Monaco, San Marino | Varies by operator | Check before departure |
| Turkey, Serbia, non-EU Balkans | No (regional agreements in progress) | Local eSIM |
Two traps deserve particular vigilance.
The fair use policy. Roaming is designed for travel, not for permanent residence abroad. Operators may cap roaming data volumes and flag you if, over four months, you spend more time connected abroad than at home. For a three-week Interrail trip, there's no risk.
Accidental roaming in border areas. In an Alpine valley or along the Rhine, your phone can latch onto a Swiss mast from a French train. If Switzerland isn't in your plan, the surprise bill follows. The reflex: turn off automatic network selection and manually pick the operator of the country you're actually in, on sensitive border sections (Basel, Geneva, Chiasso, Buchs).
eSIM: the tool that changed the game
Now that almost every recent smartphone accepts an eSIM alongside the physical card, the question of data while travelling has become much simpler. A European eSIM is bought online, activated by QR code in two minutes, and provides a data allowance valid in 30 to 40 countries, typically for €3 to €15 for 5 to 20 GB, with no phone number.
What it solves in practice:
- The Swiss and British legs that EU roaming doesn't cover.
- Tethering for a laptop, without eating into your main allowance.
- Redundancy: if one network is saturated at a station, you switch to the other.
Three useful precautions. Check that your phone is genuinely unlocked and eSIM-compatible (it's listed in the settings, under "cellular plan"). Buy and install the eSIM before you leave, while you still have a stable connection. And make sure tethering is allowed on the data plan: some very cheap offers forbid it, which makes them useless for working.
If you're travelling as a pair or a trio with several devices, a portable 4G router is often cheaper than that many eSIMs, and it saves the battery of whichever phone would otherwise serve as the hotspot.
Working seriously on board: the offline method
The real secret of travellers who put in a full day's work on a European train isn't a connection trick: it's offline organisation.
Before boarding
- Sync your files for offline use (folders available locally, not just in the cloud).
- Download maps, itineraries, tickets, podcast episodes and series. Google Maps and the SNCF, DB and ÖBB apps all allow local downloads.
- Save your tickets as PDFs or screenshots. A conductor facing a phone with no signal is under no obligation to be patient, and several operators can charge you for a new ticket if the original can't be shown. This is survival rule no. 1 of European rail travel.
- Fully charge a power bank: 230 V sockets exist on most mainline trains, but not on every regional service and not at every seat.
On board
- For a video call, aim for flat sections at steady speed and avoid tunnel entrances and station approaches, where the signal collapses.
- Use messaging in asynchronous mode rather than real-time tools.
- Pack a universal travel adapter if your route mixes the UK, Switzerland and the eurozone: trains replicate national standards, and the Swiss type J socket doesn't always accept bulky French plugs.
- On long journeys, a laptop stand or a simple tablet holder makes the seat-back tray usable, especially on trainsets where it's tiny.
Security: never forget that onboard Wi-Fi is public
An open network, with no password, shared by hundreds of strangers, should not be used to check a bank account without precautions. The recommendations of France's ANSSI and CNIL on public Wi-Fi networks apply in full on a train: stick to HTTPS sites, avoid sensitive logins, turn off file sharing, and use a VPN if you're handling professional data. Rail operators themselves point this out in the terms of their portals.
Your rights: Wi-Fi is not a guaranteed service
One question comes up constantly: can you be compensated if the promised Wi-Fi doesn't work? In practice, no. Regulation (EU) 2021/782 on rail passenger rights, applicable since June 2023, governs delays, cancellations, assistance and passenger information — but it does not make Wi-Fi a contractual service eligible for compensation. Operators' terms and conditions almost always present the connection as a service offered "subject to availability", with no guarantee of speed or continuity.
What you can usefully do:
- Report the outage to the onboard staff: on some trainsets, the router is reset and the service comes back.
- Ask for a goodwill gesture if you paid a supplement explicitly tied to connectivity (rare, but it exists on a few business offers).
- Never build a critical meeting around a train's Wi-Fi. That's the only real protection.
Bottom line: treat onboard connectivity like the weather. You check it, you hope for the best, you don't plan around it.
The ten-second recap
- Onboard Wi-Fi is a relay to the mobile network: no ground coverage, no Wi-Fi.
- Your own data is often faster than the train's shared Wi-Fi.
- EU roaming included until 2032; Switzerland and the UK excluded → eSIM.
- Best connections: SBB (via the mobile network), Frecciarossa, Italo, Eurostar, ICE, Railjet.
- Forget about: night trains, Ouigo, Spanish and Polish regional services.
- Download everything beforehand: tickets, maps, files, entertainment.
- Wi-Fi gives you no right to compensation: only delays and cancellations do, under Regulation (EU) 2021/782.
Well prepared, a Paris–Milan or Berlin–Vienna run becomes one of the best offices in Europe: seven uninterrupted hours, a proper tablet, coffee, and scenery worth more than any wallpaper. All it takes is to stop relying on the sticker on the window.
