Train event recorder
(重定向自Event Recorder)
A train event recorder (also called On-Train Monitoring Recorder (OTMR) in the United Kingdom, Event Recorder System (ERS), Event Recorder Unit (ERU), or simply Event Recorder (ER)) is a device that records data about the operation of train controls and performance in response to those controls and other train control systems. It is similar to the flight data recorder found on aircraft.