The Semmering Railway crosses the Eastern Alps between Gloggnitz and Mürzzuschlag in Austria, climbing through a landscape of viaducts, tunnels and tight curves that was utterly implausible when it was built. Completed in 1854 using only hand tools and gunpowder, it was the first mountain railway in the world to use standard-gauge track and a steam locomotive — and the engineering feat was so remarkable that it was inscribed on the UNESCO World Heritage List in 1998, one of the first railway lines anywhere to receive that designation.
The history
In the mid-nineteenth century, the Semmering Pass was a steep and difficult obstacle on the route between Vienna and the port of Trieste (then part of the Habsburg Empire). A road over the pass existed, but fast cargo and passenger movement needed something more. The Semmering Railway was built between 1848 and 1854 under chief engineer Carl Ritter von Ghega, who had studied American mountain railways and adapted their principles to Alpine conditions. The result was a 41-kilometre line that ascended nearly 460 metres using sixteen viaducts, fifteen tunnels and more than a hundred curved sections. The main viaduct at Kalte Rinne is particularly dramatic, spanning a deep valley on two tiers of arched stone.
To prove the technology could work, the Austrian Southern Railway held a locomotive competition — the Semmering trials of 1851 — in which four early steam locomotives raced up the gradient. Bavaria won. The line opened three years later and has been in continuous operation ever since.
Travelling the line today
The Semmering Railway is now operated by ÖBB, Austria's national rail company, as part of the regular intercity network. It forms part of the route between Vienna (Wien Südbahnhof / Wien Meidling) and Graz, Austria's second city — a journey of about 2h30–3 hours on the IC/EC services that use this line. This means you are travelling on a UNESCO World Heritage railway as a perfectly ordinary intercity journey, with no special ticket required beyond a normal ÖBB fare or a valid rail pass.
The most scenic section — the climb and descent over the Semmering Pass — takes roughly 45 minutes to an hour. The train passes through Semmering village, where a stop allows visitors to explore the 19th-century health resort that grew up around the railway, and continues through forested mountain terrain with views of viaducts and the valleys below.
What to see on the route
- Viadukt Kalte Rinne: The most dramatic of the sixteen viaducts, visible from the train as you cross it. Two tiers of arched masonry spanning a deep, forested ravine.
- Polleroswand tunnel: One of the longest on the original line, entering the mountain and emerging into a changed landscape.
- Semmering station: A small station in the village of Semmering itself, surrounded by the grand late-19th century resort hotels that once made this a fashionable escape from Vienna. Some are still operating; others are being restored.
- The descent to Mürzzuschlag: The line comes down into Styria through tight curves and forested gorges, with the agricultural lowlands opening up as you approach Bruck an der Mur.
Sitting on the right side of the train (travelling from Vienna toward Graz) generally gives better views of the viaducts and the valley drops on the steepest section.
Making a trip of it: stopping at Semmering
Most travellers pass through as part of the Vienna–Graz journey, but getting off at Semmering for a few hours or overnight adds a different dimension. The Semmering resort village is a fascinating relic: a collection of grand hotels and villas built when the railway made this mountain air accessible to Viennese society. The Südbahn Hotel, designed in the style of a Habsburg resort palace, is one of the most notable buildings; its fate (restoration, reopening) has been an ongoing story for many years. The views over the railway line and the surrounding ridges are excellent from several walking trails starting from the village.
Practical planning
- ÖBB intercity trains between Vienna Meidling (or Wien Hauptbahnhof) and Graz use the Semmering line; always check the routing on booking as some trains use an alternate route via the Koralmbahn tunnel (the newer high-speed bypass that opened in 2025 and cuts journey time significantly — but misses the UNESCO section entirely).
- If the purpose is to ride the historic mountain section, select a train that goes via Semmering (labelled as via Semmering or Bruck an der Mur) rather than the new tunnel route. Both options are typically available and the older route takes longer but is much more scenic.
- ÖBB tickets can be bought through the ÖBB website (oebb.at) or app. Interrail and Eurail pass holders can use this route without a reservation surcharge on domestic Austrian services.
- The scenic section is usable year-round, including in winter when the forested ridges are snow-covered — a notably atmospheric time to travel it.
Combining with Vienna and Graz
The Semmering Railway fits naturally into a trip that includes both Vienna and Graz. Vienna has direct international rail connections to Munich, Salzburg, Budapest, Prague and beyond; Graz is a university city and the gateway to Styria's wine country and the Slovenian border. Travelling between the two cities by the historic mountain route rather than the new tunnel is a minor detour in time but a major gain in experience.
From Graz, trains connect to Salzburg and on to Munich, or south toward Klagenfurt and the Slovenian border at Maribor. A loop that includes Vienna, the Semmering Railway, Graz, Salzburg and Munich (or Innsbruck) makes for a cohesive Central European rail journey.
Frequently asked questions
Is the Semmering Railway a tourist train or a regular service?
It is a regular intercity service operated by ÖBB — the same trains that connect Vienna and Graz. No special ticket is needed beyond a normal ÖBB fare or valid rail pass. The historic route is a bonus of choosing the Semmering routing rather than the newer Koralmbahn tunnel.
How long is the most scenic section?
The UNESCO-listed mountain section between Gloggnitz and Mürzzuschlag is about 41 kilometres and takes roughly 45 minutes to an hour to traverse.
Do I need a reservation to travel on the Semmering Railway?
No. ÖBB intercity and EC trains in Austria generally do not require seat reservations. You can board with a valid ticket or rail pass without pre-booking a seat.
Is the Semmering Railway covered by Interrail or Eurail?
Yes. Both passes cover ÖBB trains in Austria, including the Vienna–Graz intercity services that use the Semmering line. No reservation surcharge applies for domestic Austrian journeys.
Sources and further reading:
- Timetables and tickets: ÖBB (oebb.at).
- UNESCO World Heritage listing: UNESCO.
- Route history and travel advice: The Man in Seat 61.