Roll over of a CGH2 cylinders trailer

A semi-trailer truck carrying compressed hydrogen cylinders skidded and overturned at a railway underpass due to excessive speed, blocking both lanes.
The cylinders were empty, with still a pressure of 20 bar. The load was inspected by chemical experts, who performed a controlled release reducing the pressure to 1 bar. The recovery of the vehicle and its cargo followed. The recovery operations continued from morning until the afternoon.
The accident also caused disruptions to rail traffic. For safety reasons, the local train service was suspended. Rail passengers had to endure delays of up to half an hour, by using a bus service replacement.
Police estimate the property damage at approximately 100,000 Swiss francs.

INITIATING CAUSE was a traffic accident. In absence of information on drivers and driver behaviours, the ROOT CAUSE can be attributed generically to a human error (excessive speed of the driver).

roll over

The CGH2 cylinders were almost empty

A controlled release was performed, able to reduce the pressure in th ecylinders from 20 bar to 1 bar. After which, the recovery operation could start.