競きょう合ごう脱だっ線せん

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.

• 事じ故こ調ちょう査さ委い員いん会かいは、この脱だっ線せんを競きょう合ごう脱だっ線せんと断だん定ていした。

  The accident investigation committee determined this derailment to be a concurrence-of-causes derailment.

• 競きょう合ごう脱だっ線せんは、複ふく数すうの要よう因いんが重かさなって発はっ生せいする。

  A concurrence-of-causes derailment occurs when multiple factors coincide.