Key takeaways
- Class 406 is the multi-system ICE 3 – built for services that cross system boundaries.
- Barely distinguishable from the 403 visually: the difference is on the roof and in the markings.
- Multi-system capability costs power: considerably less traction power is available under DC than under AC.
- Lounge present – that separates 403 and 406 from the newer Velaro Classes 407 and 408.
- Deployment areas and approvals change, because cross-border services depend especially heavily on agreements and timetables.
Contents
Fact file
| Vehicle type | Multi-system high-speed multiple unit with distributed traction |
|---|---|
| Train formation | eight coaches, all with passenger space |
| Electrification systems | AC 15 kV / 16.7 Hz and 25 kV / 50 Hz, plus DC systems |
| Power output | around 8,000 kW under AC, considerably less under DC |
| Design maximum speed | 330 km/h; lower in service depending on network and approval |
| Special feature | Lounge behind the driver's cab, as on Class 403 |
| UIC type code | 93 (high-speed multiple unit) |
| Numbering scheme | vehicle numbers start with 406 |
| Typical use | cross-border ICE services |
Identifying features
Is this really the class in front of you?
- Looks like Class 403 from the outside: no power cars, flat pointed nose, windows right to the front
- More roof equipment and additional pantographs for different electrification systems
- Markings and approval labels for several countries on the coach body
- Lounge behind the driver's cab present – unlike Classes 407 and 408
- Vehicle number starts with 406, not 403
- Often found on cross-border trains rather than pure domestic services
Updated: August 2026 – Looks like an ICE 3, but is technically a different vehicle: Class 406 is the multi-system variant of the ICE 3. It runs where contact-wire voltage and train protection change at the border. This page shows how to tell it apart from Class 403 and why that’s a worthwhile distinction for spotters.
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403 or 406 – the difference decides how valuable your sighting is. Logged with Traintrack in seconds.
What is Class 406?
Class 406 is the multi-system ICE 3, usually referred to operationally as the ICE 3M. It shares the coach body, traction concept and basic shape with Class 403, but is equipped for several electrification systems: AC at 15 kV and 16.7 Hz as in Germany, AC at 25 kV and 50 Hz, and DC systems as used in several neighbouring countries.
This multi-system capability isn’t a detail – it’s the whole reason the class exists. A single-system vehicle ends at the system boundary. A multi-system train runs straight through – no locomotive change, no changing trains. The price is considerable technical complexity: more power electronics, several pantographs with different pan heads, several train protection systems on board, and less traction power available under DC.
Like all high-speed multiple units, the 406 also carries the UIC type code 93 in the first two digits of its twelve-digit vehicle number. How this number is structured is explained in the article on the UIC number and its check digit.
How to tell 406 and 403 apart in the field
The basic shape won’t help you here – it’s practically identical for both classes. You need to check three other things instead.
Look at the roof
The multi-system variant carries more equipment and additional pantographs. From an elevated viewpoint or a side-on shot, this is the fastest way to tell.
Read the markings
Multi-system vehicles carry labels for the countries they're approved in, plus additional technical markings. A pure domestic train doesn't have these.
The number is the final authority
406 instead of 403 – on the coach body and in the data panel. That's the one observation that's always unambiguous.
Exactly where these numbers can be found on the vehicle is shown by the guide Finding the train number.
Context is a strong hint
An ICE 3 used on a cross-border service is highly likely to be a multi-system vehicle. That doesn't replace the number, but it helps narrow things down – and during a passing train, narrowing things down is often all you get time for.
Placing it in the ICE 3 family
The name “ICE 3” today covers four different classes. The table below sorts them by the features actually visible in the field.
| Class | Electrification systems | Lounge behind driver’s cab | Identification aid |
|---|---|---|---|
| 403 | Single-system | yes | slim roof equipment, domestic services |
| 406 | Multi-system | yes | additional pantographs, country markings |
| 407 | Multi-system | no | closed wall behind the driver’s cab |
| 408 | Multi-system | no | newest build, modern doors and displays |
Anyone wanting to learn the whole ICE family systematically will find the comparison in the article ICE classes 1 to 4 compared. The direct successor in cross-border services is Class 407, and the newest build is Class 408.
Cross-border sightings are valuable
Log where you saw which multi-system variant – entries like that become especially interesting later on.
What multi-system capability means technically
The term sounds harmless, but it describes a considerable amount of engineering effort. At a system boundary, it’s not just one number in the contact wire that changes, but several things at once – and a vehicle that’s meant to run through has to handle all of them.
- Voltage and frequency. Germany runs on 15 kV AC at 16.7 Hz. Other networks work with 25 kV at 50 Hz or with DC. The power electronics on board have to turn all of this into a usable traction voltage.
- Pantographs. The permitted pan-head width differs from country to country. That’s why a multi-system train carries several pantographs, of which the right one is raised depending on the network. That’s exactly what you see on the roof.
- Train protection. Every country brings its own systems. They have to be on board and approved, or the journey ends at the border – regardless of whether the traction itself would work.
- Available power. Considerably less traction power is available under DC than under AC. That’s not a footnote: it affects acceleration and therefore journey time.
For identification in the field, the second point is especially useful. Additional pantographs are the visible proof of multi-system capability – and the reason why the roof section of a 406 differs from that of a 403, even though the two vehicles otherwise look the same.
Spotting and photography
Cross-border services run at a lower frequency than domestic ones. For spotters that means: fewer opportunities, but ones that are easier to plan for. Major long-distance hubs and border stations are the obvious locations, because that’s where dwell times occur and you have time for roof and marking shots. Amsterdam Centraal is one such terminus: the 406 stands there scheduled for long enough for both. At hubs like Brussels South, it also meets Eurostar’s high-speed trains.
- Side-on shot including the roof. This is the only way to document the pantographs – a pure head-on shot loses that information. From the Hohenzollern Bridge in Cologne, you get this perspective even without a platform ticket.
- Photograph the data panel too. An extra detail shot of the vehicle’s data panel makes the sighting clearly verifiable later.
- Expose tightly. The white vehicle front blows out quickly in sunshine.
- Fast shutter speed for passing trains. 1/1000 s is the starting point, and at high speed it’s more likely too slow than too fast.
The basic technique is covered in the guide taking good photos of trains, and the question of the right focal length is covered by the article on the best telephoto lens for railway photography.
Take the suction effect seriously
When an ICE passes at high speed, the pressure wave is followed by a strong suction towards the track. It can knock people off balance and pull away light equipment. Stay firmly behind the safety line, step further back for announced non-stop passages, and secure your tripod and bags. More on this in the guide on safe distance from the track. Tracks and operational railway land are never an accessible photo spot.
Cross-border services: what changes for spotters
A vehicle approved to run on several networks behaves differently from a purely domestic one – and that has a direct effect on observation.
- Fewer diagrams, longer runs. Cross-border services run less frequently than domestic ones. In return, the trains cover long distances and turn up at widely separated locations.
- Greater sensitivity to disruption. If a multi-system vehicle fails, it can’t simply be replaced by just any other one. Substitute plans often involve changing trains at the border – something observers regularly get to witness live.
- Dwell times at system-change points. Wherever the electrification system or train protection changes, operational stops occur. These are the places where you can calmly check the roof, markings and number – on the western corridor, for example at Brussels South / Bruxelles-Midi.
- Documentation pays off twice over. A sighting abroad or near the border says more than the same sighting in domestic service, because it proves the vehicle’s actual operating radius.
Anyone who collects observations like this ends up, over time, with a more realistic picture of how the class is used than any static overview could give. The guide on keeping a sightings log shows how to record this cleanly and in a way you can analyse.
Common mix-ups
It points to Class 406 if …
- the train looks like an ICE 3 but carries more roof equipment
- markings indicate approval in several countries
- there's a lounge behind the driver's cab
- the number starts with 406
Look more closely if …
- you can't see the roof
- the train is running in domestic service – that also happens
- you only have a head-on shot where the markings are missing
It isn't a 406 if …
- the area behind the driver's cab is closed off – then it's 407 or 408
- the train has windowless power cars – then it's ICE 1 or ICE 2
- the coach bodies tilt in curves – then it's ICE T
Conclusion
Class 406 is the ICE 3 that runs across system boundaries. Visually it stays a 403 – which makes it one of the few ICE classes where shape and silhouette alone aren’t enough to identify it. The roof, the markings and the vehicle number are the way to go here. Once you’ve internalised that, you can cleanly tell the ICE 3 family apart from then on.
In brief
ICE 3 shape plus additional pantographs plus country markings: that's Class 406. The lounge separates it, together with the 403, from the newer Velaro builds – the number is the final authority.
Keep the ICE 3 variants cleanly apart
403, 406, 407 and 408 in one log – so you can see at a glance which variant you're still missing.
Summary
- Class 406 is the multi-system variant of the ICE 3 and thus the vehicle for connections across system boundaries.
- Roof equipment, country markings and above all the vehicle number help you tell it apart from Class 403.
- The lounge behind the driver's cab separates it from the Velaro Classes 407 and 408.
- Exactly where the trains run depends on approvals and timetables and changes regularly.
Frequently asked questions
What is Class 406?
Class 406 is the multi-system variant of the ICE 3. It's based on the same design as Class 403, but can run under several electrification systems and is equipped for cross-border services. That's why it carries extra pantographs and more equipment on the roof.
How do I tell Class 403 and 406 apart?
From the side this is hard, because both classes share the same basic shape. Reliable ways are the vehicle number on the coach body, the 406's additional pantographs and roof fittings, and the markings with country codes. A train in cross-border service is also a strong hint.
Why does Class 406 have several pantographs?
Because contact-wire voltage, frequency and pan-head width differ from country to country. A multi-system vehicle therefore needs different pantographs and power electronics that can handle both AC and DC. That's the most visible technical difference from the single-system variant.
Does Class 406 run at the same speed everywhere?
No. The design maximum speed is 330 km/h, but in service the state of the route, train protection system and national approval decide. Under DC, considerably less traction power is also available, which affects acceleration and timetable planning.
Does Class 406 have a lounge with a forward view?
Yes, like Class 403, the 406 also has a passenger area behind the driver's cab that's separated from the cab only by a glass wall. Whether the privacy screen is opened is entirely up to the train crew. The newer Classes 407 and 408 don't have this area.
What does ICE 3M mean?
The M stands for multi-system (mehrsystemfähig). It's an operational designation, not an official class name – officially it's class number 406. Variants with additional equipment for France also carry the designation ICE 3MF.
Where are you most likely to encounter Class 406?
On cross-border ICE services and the approach routes to them. Which routes are currently worked by which class depends on approvals, vehicle availability and the timetable, and changes regularly – rely on current sightings.
Why does the vehicle number start with 93?
The twelve-digit vehicle number starts with the UIC type code. 93 stands for high-speed multiple units and applies equally to all ICE classes. Only the following digits, including the class number, make the individual vehicle uniquely identifiable.
Log your sighting of the DB Class 406 (ICE 3)
Date, location and vehicle number logged in seconds – and visible to the community.
Related classes
DB Class 403 (ICE 3)
The ICE 3 of Class 403 is the first ICE without power cars: eight coaches, distributed underfloor traction, 330 km/h and the lounge with a view ahead. Here's how to recognise it.
High-speedDB Class 407 (ICE 3)
Class 407 is the Siemens Velaro D: a multi-system ICE 3 of the second design generation – without the lounge behind the driver's cab and with its own nose shape.
High-speedDB Class 408 (ICE 3)
Class 408 is the ICE 3neo, the newest build of the ICE 3 family: eight coaches, multi-system, no lounge – and clearly distinguished from 403 and 407 by modern details.
High-speedDB Class 415 (ICE T)
The Class 415 is the five-car variant of the ICE T: the same tilting technology as the Class 411, the same body profile – just considerably shorter and rarer.
High-speedICE L (Talgo 230)
The ICE L is the most unusual ICE of all: a low-floor Talgo articulated train with very short coaches, single-axle running gear and a locomotive at the front.
High-speedAlstom Coradia Max
Coradia Max is the product designation under which Alstom markets double-deck vehicles. In service, what counts isn't this name but the German class number on the vehicle.
Who is behind it
Groups, brands, manufacturers and operators – who owns whom and how to recognise them out in the field.
Where to see the DB Class 406 (ICE 3)
Specific viewpoints with lighting times, coordinates and an honest verdict on whether the trip is worth it.
Amsterdam Centraal
Amsterdam Centraal stands on three artificial islands in the IJ, has one of the best-known station façades in Europe, and channels all of the Netherlands' international traffic. For spotters it's also the country's most difficult major station – because of the crowds.
Junction stationAntwerpen-Centraal
Antwerpen-Centraal is often called the most beautiful station in Europe, and for once that's not an exaggeration. Under the monumental domed hall there are now three platform levels stacked on top of each other – the terminus became a through station without the hall being touched.
Junction stationBrussels-South / Bruxelles-Midi
Brussels-South is Belgium's most important international station: high-speed trains leave here for Paris, London, Amsterdam and Cologne. The area for the Channel Tunnel trains is cordoned off and controlled – the rest of the station is open to you.
Photo spotHohenzollern Bridge Cologne
The Hohenzollern Bridge is the busiest railway bridge in Europe – and one of the few top-tier spots that costs nothing and is open around the clock. A public footpath runs directly alongside the tracks on both sides, with the cathedral standing in the background.
Related guides from the blog
