On October 23, 2018, an escalator at Rome's Repubblica metro station malfunctioned, resulting in a sudden, uncontrolled acceleration downwards that injured oven twenty people. Investigations revealed that the incident was caused by the failure of the primary brake, a faulty safety relay, and the intentional disabling of the auxiliary brake, highlighting issues of maintenance negligence and overridden safety features.
https://en.wikipedia.org/wiki/2018_Rome_escalator_accident