Overview
The S3 is not a train that shouts for attention, and that is precisely its appeal. It slips along the edge of Lake Constance between St. Margrethen and Lindau, doing the quiet, useful job of connecting two countries without any fuss, ceremony, or inflated sense of occasion.
This is a regional S-Bahn service run by ÖBB-Personenverkehr AG under the Verkehrsverbund Vorarlberg banner, so it behaves like the working transport it is: practical, frequent by regional standards, and built for people who actually live and travel in this corner of Europe rather than for tourists chasing a headline route. That said, the geography does a lot of the work for you.
Anyone expecting Alpine drama at every turn should recalibrate. What the S3 offers instead is the gentler pleasure of watching a lake landscape unfold at a sensible pace, with Switzerland, Austria and Germany all folded into a short and unpretentious journey.
Key facts
| From | St. Margrethen |
|---|---|
| To | Lindau |
| Operator | ÖBB-Personenverkehr AG |
The route: three countries, one lake
St. Margrethen sits on the Swiss side, and from there the S3 heads toward Lindau on the German shore of Lake Constance, threading through Vorarlberg in Austria along the way. In the space of one short journey you cross national borders twice, which is a novelty that never quite wears off, even for people who ride this line often.
The character of the landscape is shaped by the lake itself: low-lying, open, and softened by water on one side for much of the way. It is not a mountain railway and does not try to be one, but the presence of the water gives the trip a calm, expansive feel that many high-drama Alpine routes lack. It rewards patience rather than anticipation.
Timetable and booking
Because this is a regional S-Bahn service, frequency and timing vary according to season and day of the week, and there is no substitute for checking directly with ÖBB-Personenverkehr AG before travelling. Do not rely on assumptions carried over from a previous trip, particularly if you are travelling outside the core commuting periods.
Booking is generally straightforward for this type of service, in keeping with its role as everyday regional transport rather than a reservation-only tourist train. Even so, always confirm current timetables, any seasonal adjustments, and ticketing requirements with the operator before you set off, especially if you are connecting onward on a tight schedule.
Fares and classes
As with timetables, specific fares should be checked with ÖBB-Personenverkehr AG rather than assumed. What can be said in general terms is that regional services of this kind typically offer a distinction between classes based on comfort and seating layout rather than dramatically different levels of service.
A higher class on a train like this usually means a little more space, a quieter carriage atmosphere, and marginally more comfortable seating, while the more basic class remains entirely serviceable for a journey of this length. Given how short the St. Margrethen–Lindau run is in character, most travellers will find either class perfectly adequate, and the choice is more about personal comfort preference than necessity.
Which side to sit for the best views
Lake Constance is the visual anchor of this journey, so the general principle is simple: sit on the side of the train that faces the water for the best of the scenery. Exactly which side that is will depend on the direction of travel, so it is worth taking a moment on the platform to get your bearings before boarding.
Because the route hugs the lake for a meaningful stretch, choosing the lakeside seat pays off more here than on many short regional journeys. If the carriage is not full, it is also worth switching sides partway through, since the perspective on the water and the shoreline changes as the train moves between the Swiss, Austrian and German sections of the route.
Onboard experience
Expect the onboard feel of a well-run regional service rather than a long-distance flagship train: functional, clean, and geared toward efficient movement of passengers rather than an elaborate travel experience. Windows are generally a strong feature on trains of this kind, given how much of the appeal lies in the lake views, so even a short hop offers decent sightlines.
Do not expect elaborate catering; regional S-Bahn services of this type are not typically built around onboard dining, so if refreshments matter to your journey, it is sensible to sort them out before boarding at St. Margrethen or plan to find something after arrival in Lindau. The overall atmosphere tends to be relaxed, with a mix of commuters, cross-border travellers and the occasional curious visitor drawn by the lake.
Best season to travel
Lake Constance changes considerably with the seasons, and that shifts the character of this journey more than the timetable does. Summer brings long daylight, a lively lakeside atmosphere at either end of the route, and the clearest views across the water, though it is also when the region is busiest with visitors.
Spring and autumn tend to offer a quieter, softer version of the same scenery, often with fewer people competing for the best window seats. Winter brings its own appeal, with a stiller, more subdued lake and crisper light, though shorter days mean less time to enjoy the views if you are travelling in the late afternoon. There is no single best time, only different moods, and the right choice depends on whether you prefer lively shorelines or quiet ones.
Alternatives and onward connections
Lindau functions as a natural hinge point for onward travel, with the town's position on Lake Constance making it a sensible base for continuing into the wider Bavarian and Lake Constance region. From here, travellers typically look to further regional and national rail connections to continue their journey, though exact services and routings should always be confirmed with the relevant operator.
In the other direction, St. Margrethen offers its own connections into the Swiss rail network, making the S3 a useful link for travellers piecing together a longer cross-border itinerary around Lake Constance rather than a final destination in itself. For those who prefer not to commit to rail throughout, lake steamers and boats are a well-known feature of this region generally, though specifics of any such connections should be checked locally rather than assumed from this guide.
A little context
The S3's role fits into a long tradition of railways built to link communities around Lake Constance, an area where borders have always mattered less to daily life than the shared geography of the lake itself. Services like this one grew out of the practical need to move people between towns and countries that sit close together on the map but fall under different national administrations.
Today it continues that tradition in its current form, run as a regional S-Bahn service by ÖBB-Personenverkehr AG within the Verkehrsverbund Vorarlberg network, a modern expression of a much older cross-border relationship between the communities that ring the lake.
Common questions
- Do I need to book in advance for the S3?
- As a regional S-Bahn service, advance booking is generally not the central feature of travel on this line, but you should confirm current requirements and timetables with ÖBB-Personenverkehr AG before travelling.
- Which side of the train should I sit on for the best lake views?
- Sit on whichever side faces Lake Constance for your direction of travel; check your orientation on the platform beforehand, and consider switching sides mid-journey if the carriage allows it.
- Is there food or drink available on board?
- Regional services of this type are not generally built around onboard catering, so it is wise to bring refreshments with you or plan to eat at either end of the journey.
- How do fares work for first and second class?
- Exact fares must be checked with ÖBB-Personenverkehr AG, but in general the higher class offers more comfort and space while the standard class remains perfectly adequate for this length of journey.
- Can I connect onward easily from Lindau or St. Margrethen?
- Yes, both towns serve as useful connection points into their respective national rail networks, and Lindau's lakeside position also makes it a practical base for wider regional travel; always confirm specific onward services locally.
On the map
Sources & method
- OpenStreetMap route=train (ODbL) — route
See our methodology for how Head Your Way sources and reviews travel data.