On December 18, 1974, a major train collision occurred near Lyon, France, when two trains collided due to a signal failure and a mistake by the train conductor. The crash led to the deaths of 100 passengers and injured over 200. The incident became one of Frances deadliest rail accidents, drawing attention to the countrys rail safety measures. The disaster prompted an overhaul of French railway safety protocols and increased scrutiny of railway infrastructure across Europe. The tragedy left families devastated and marked a somber moment in European transport history.