The Wiener Linien transport company said that one of the tram drivers had flicked the wrong switch, meaning he couldn’t then prevent his tram from colliding into an oncoming one. He was travelling in the direction of Neuwaldegg.
“The accident happened as the tram tracks curved round from Lazarettgasse into Zimmermannplatz,” a police spokesman said. The sides of the trams collided, causing significant damage.
The injured passengers were cared for by five rescue teams and ten people were taken to hospital. Both tram drivers were uninjured.
A regular service on the number 43 line was resumed by 6:30pm.
Experts from the Wiener Linien examined the signal box but said it was technically correct. The driver who caused the crash has been suspended from duty, with immediate effect.