Definition of "probabilistic"

Johnson explained that absolute gauging assumed that everything that could go wrong would go wrong at the same time, resulting in the train hitting the platform. In contrast, probabilistic gauging says that everything can go wrong, but not at the same time. For the Pitsea '357', probabilistic gauging estimated a 0.00001% chance of the train hitting the platform. That seems much closer to the daily life of Pitsea Platform 2.

2023 April 19, Philip Haigh, “Gauging ways to ensure rail freight gains more paths”, in RAIL, number 981, page 45