Cable Fire at Praterstern: Whole Cable Duct Burned Out, Vienna S-Bahn Paralyzed Cable fire at Praterstern in Vienna: an entire cable duct in the signal box burned out. Around 20 km of cables must be replaced — the S-Bahn Stammstrecke stays closed for weeks. Topics: News, Transport.

In the night to Thursday, an entire cable duct burned out at Vienna’s Praterstern station. The cable fire in the signal box paralyzed Austria’s most important S-Bahn line: no trains are currently running between Praterstern and the main station. ÖBB must replace around 20 kilometres of cables, and repairs will take at least until early September. This article covers the timeline of the incident, the affected lines, how to still reach the airport, and when service is expected to recover.

What happened overnight

The fire was discovered at around 1:30 a.m. on Thursday near Praterstern station. The Vienna professional fire brigade was on site until about 4 a.m. with six vehicles and around 30 personnel, spokesman Gerald Schimpf said. Locating the fire took a while, and ÖBB staff first had to check switches before extinguishing could begin. After the fire was put out, the area was ventilated.

An ÖBB spokesperson confirmed to MeinBezirk that an entire cable duct in the Praterstern signal box (Stellwerk) burned out. The cables control not only Praterstern station but also Wien Mitte and Rennweg — which is why signals fail on the affected section and switches cannot be set.

Various signal boxes in the area are controlled from Praterstern.

— Judith Winder, ÖBB spokesperson, to krone.at

Around 20 kilometres of cables must be replaced

The extent of the damage was initially unclear. On Thursday evening, ÖBB announced that around 20 kilometres of cables are damaged and need to be replaced. Affected lines include the power supply for the signal box, telematics and the overhead lines. As ORF Vienna reports, the repair will take at least until 7 September — the scheduled start of the main closure of the S-Bahn Stammstrecke.

ÖBB is bringing forward the timetable prepared for the September closure: from Friday, 14 August, an emergency timetable (Notfahrplan) applies. Suburban trains heading south currently depart from Vienna’s main station or partly from Vienna Meidling. The ÖBB press office confirms that work on the damaged infrastructure is in full swing.

Which lines are affected

The cable fire at Praterstern hits the S-Bahn Stammstrecke hardest — the heart of Vienna’s commuter network, used by around 800 trains and 250,000 passengers per day. In detail:

• S-Bahn Stammstrecke: no service between Vienna Praterstern and Quartier Belvedere
• S7 (airport express line): runs only from Geiselbergstraße station
• CAT (City Airport Train): not running to the airport
• Wien Mitte–Geiselbergstraße: replacement bus service (Schienenersatzverkehr) in place

Passengers on the closed section between Praterstern and Quartier Belvedere are asked to switch to Wiener Linien city transport. ÖBB tickets are accepted on Wiener Linien, an ÖBB spokesperson confirmed to Kurier. Additional customer service staff are on duty at Wien Mitte, Rennweg and Geiselbergstraße.

How to still reach the airport

Vienna Airport remains accessible despite the impact on the S7 and CAT. The S7 continues to run between Geiselbergstraße and Vienna Airport, and on to Fischamend. Replacement buses connect Wien Mitte and Geiselbergstraße. Long-distance service between Vienna’s main station and the airport is not affected by the closure.

Additional alternatives:

• Vienna Airport Bus still connects the airport directly with the city centre
• Long-distance trains via Vienna’s main station
• Underground lines of Wiener Linien with accepted ÖBB tickets

Passengers should allow extra time and check connections via SCOTTY, oebb.at or the ÖBB customer service line at 05-1717.

How long the disruption lasts

ÖBB expects several weeks of work. Officially, the repair will take at least until 7 September. But the cable fire may affect the S-Bahn’s recovery for longer: krone.at reports, citing ÖBB, that the Stammstrecke could remain severely restricted until October 2027 due to the damaged signal box technology — effectively extending the already planned 14-month main closure that starts in September.

What the emergency timetable means for commuters

The Notfahrplan applies from Friday, 14 August, until further notice. Commuters from the north and south must expect significantly longer travel times and combine S-Bahn, underground and replacement buses. ÖBB recommends switching to Wiener Linien, where ÖBB tickets are accepted.

If you regularly ride the S-Bahn, check out our overview of Vienna’s summer of construction — it lists all planned closures of underground, S-Bahn and tram lines. The August changes digest covers key dates for transport and everyday life in Austria this month.

Frequently Asked Questions

When will the S-Bahn Stammstrecke run again? ÖBB expects repairs to take at least until 7 September. Because of the planned main closure from September, the Stammstrecke could remain restricted until October 2027.

Which lines are affected by the cable fire? The S-Bahn Stammstrecke between Praterstern and Quartier Belvedere, the S7 from Geiselbergstraße and the CAT. Replacement buses run between Wien Mitte and Geiselbergstraße.

Can I still get to Vienna Airport? Yes. The S7 runs from Geiselbergstraße to the airport, and long-distance service from the main station is unaffected. Alternatives include the Vienna Airport Bus and Wiener Linien.

Are ÖBB tickets valid on city transport? Yes. ÖBB tickets are accepted on Wiener Linien on the affected sections.

What happens next

The cable fire at Praterstern has shown how vulnerable Vienna’s railway infrastructure is — a single cable duct brought Austria’s busiest commuter line to a standstill. Until the 20 kilometres of cables are replaced, the emergency timetable stays in force. Allow more time in the coming weeks, use the Wiener Linien and check connections before you leave. Stay updated on Vienna’s transport situation — subscribe to our newsletter.