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In the US the Federal Railroad Administration (FRA) requires all event recorders to store the last 48 hours of train data (brake pipe pressure, dynamic brake, Horn , Track Signal , etc.). Every 48 hours the information is overwritten in a continuous loop. The logic behind the 48 hour requirement is that in a typical derailment, information in the front Locomotive may be lost, while the information in the second locomotive may still be intact. However, any surviving locomotives of an accident are generally used in the accident cleanup. The 48 hour period provides sufficient time for the accident investigators to get to the locomotives or the site and download the accident information. In the US event recorders are required on all locomotives that can get onto the US rail network which includes all freight, passenger and commuter rail locomotives but not transit which runs on its own dedicated tracks. On June 30 2005 , the United States Federal Railroad Administration issued a ruling requiring locomotive event recorders on trains operating in the US be more resistant to the loss of data from exposure to fire, impact, fluid immersion and other damage that could occur in the event of a Train Accident . (FRA) HISTORY The earliest event recorders were the mechanical Hasler speed recorders which appeared in the 1920s. These drew with ink on rolls of paper and recorded time and speed. |
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