When they said there were thousands of derailments each year in the U.S. i found a source on the internet that said the total for all derailments in Japan in 2020 was a grand total of 6.
Basically we’re averaging 1,704 derailments a year between 1990 and 2021, and likely very few of them are significant since last year per the article there were 4 deaths.
So, question: what is the legal definition of a derailment and does it differ between here and Japan?