Železničná spoločnosť Slovensko (ZSSK)

Updated: August 2026 – There are few countries where identifying a train goes as fast as in Slovakia. The class number has three digits, and the first digit tells you the traction type and electrification system. The rest, you just have to know: Železničná spoločnosť Slovensko is, in fact, only the passenger side. Freight and the network were split off in two steps and today belong to other companies.

Log class numbers on the go

Three digits plus a running number – noted in seconds, even if the train only stops briefly.

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A passenger railway born from two splits

In 1993, the division of Czechoslovakia created the Železnice Slovenskej republiky (ŽSR) as the Slovak state railway. In 2002 came the split of network and operations: ŽSR remained the infrastructure manager, and train operations were spun off. In 2005, these train operations were split again – into ZSSK for passengers and ZSSK Cargo for freight.

The result is today’s situation: three companies that share the same root and now work separately. If you write only “Slovak state railway” in a sighting list, you have not actually named an operator.

The first digit tells you almost everything

The Czechoslovak designation scheme is one of the most elegant in Europe – and it still applies today in both successor states, so also at České dráhy and at ČD Cargo.

Within groups 4 to 6, the number further distinguishes electrification system and design; this finer level is less clear-cut than the first digit, and we deliberately do not present it here as a fixed key. For everyday practice the first digit is entirely sufficient – how to narrow down a design from there is shown in the guide to identifying classes.

Two electrification systems, one system boundary inside the country

The second point where Slovakia stands out: it has two railway electrification systems. The older part of the network runs on 3 kV DC, the part electrified later on 25 kV at 50 Hz. The boundaries between them lie not at the national borders, but in the middle of the network.

For you at the trackside, that has a pleasant consequence: multi-system locomotives are an everyday sight here. Classes 350, 362 and 363 run on the through long-distance corridors, because otherwise a train would have to change locomotive en route. In countries with only one system, you see such vehicles almost only in cross-border traffic.

On top of that comes a special case in the east: a line with 1,520 mm broad gauge runs from the Ukrainian border to the steelworks near Košice. Traffic on it belongs to the freight side and therefore not to ZSSK.

Who else runs on the same corridors besides ZSSK

The main corridor Bratislava–Žilina–Košice is the country’s only corridor with noteworthy competition. There, alongside ZSSK, the Czech operators RegioJet and Leo Express run their own trains in clearly different liveries. In regional services, individual networks are awarded to further operators.

The network itself belongs to ŽSR – the Slovak equivalent of Správa železnic in the Czech Republic. Both are pure infrastructure companies with no train services of their own.

In practice, that means for choosing a spot: Bratislava hlavná stanica shows you international traffic towards Austria and the Czech Republic, and Žilina, as the central hub, the east–west corridor along with freight traffic. A considerable share of the vehicles you meet there come from Czechoslovak production – above all from Škoda in Pilsen.

Two countries, one designation system

With the Traintrack app, Slovak and Czech sightings land in the same searchable list.

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ZSSK, ZSSK Cargo or a private operator?

Conclusion

Slovakia is a rewarding destination for spotters who like a system. Three digits are enough to roughly place a vehicle, and the same logic carries across the border into the Czech Republic. Two electrification systems in the same country mean multi-system locomotives are the rule rather than the exception.

The pitfall lies, as almost everywhere, in the structure. ZSSK is the passenger side, not “the railway”. Freight, the network and part of long-distance services belong to others. Anyone who notes the class number and the data panel alongside it sidesteps the problem – and keeps a list that will still hold up in ten years. How to build one is set out in the guide to keeping a sighting log.

One system, two countries, one list

Class, running number, date and place – four details that hold up equally well in Slovakia and the Czech Republic.

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