noun
derailment due to multiple concurrent causes
A railway technical term for a derailment caused by the combination of several factors, none of which alone would have caused the accident. Used in accident reports and engineering contexts.
事故調査委員会は、この脱線を競合脱線と断定した。
The accident investigation committee determined this derailment to be a concurrence-of-causes derailment.
競合脱線は、複数の要因が重なって発生する。
A concurrence-of-causes derailment occurs when multiple factors coincide.
Compound of 競合 (concurrence) and 脱線 (derailment). The term is a technical coinage used in railway safety engineering.