The collision between two trains occurred during Monday's morning rush hour in the city's Penzing area, with passengers waiting for up to two hours for firemen to remove them from the wreckage, the Austrian Times reported.
The driver of the train and one passenger were taken to hospitals by helicopter with life-threatening injuries. Three others were critically injured and 36 suffered minor injuries. Passengers in shock were treated at the scene before they were sent to hospitals by ambulance, the newspaper said.
Last week commuter groups complained the train route, the final route into Vienna from western Europe, carried too much traffic.