This is not how redundancy works on cable cars. These systems are not copies of another, but different systems with different working principles. On systems with a pulling component (like the cable here) and a suspension component (like a suspension rope or rails), a safety brake on the cabin is only held open by the tension of the pulling cable. Should the pulling force bee too low, the brake clamps onto the suspension component.
Most of the time there’s sadly no medial coverage of the safety systems. So with the accidents I followed either I don’t know why the safety systems didn’t work, or they were manipulated. For example in the 2021 case at Monte Mottarone, the brake was propped open with maintenance tools.
Given the age of the system in Lisbon, I hope it was updated to these safety standards. The most informative I could see was this image showing the underside of the wagon. It is still difficult to tell how it works in detail, but the thing protruding from the cable mount could be such a catching brake working on the inside of the cable guide I think. And to me it looks like the cable pulled out of the holder due to cracks in the holder.
This is not how redundancy works on cable cars. These systems are not copies of another, but different systems with different working principles. On systems with a pulling component (like the cable here) and a suspension component (like a suspension rope or rails), a safety brake on the cabin is only held open by the tension of the pulling cable. Should the pulling force bee too low, the brake clamps onto the suspension component.
Most of the time there’s sadly no medial coverage of the safety systems. So with the accidents I followed either I don’t know why the safety systems didn’t work, or they were manipulated. For example in the 2021 case at Monte Mottarone, the brake was propped open with maintenance tools.
Given the age of the system in Lisbon, I hope it was updated to these safety standards. The most informative I could see was this image showing the underside of the wagon. It is still difficult to tell how it works in detail, but the thing protruding from the cable mount could be such a catching brake working on the inside of the cable guide I think. And to me it looks like the cable pulled out of the holder due to cracks in the holder.