A Train event recorder (also called an On-train monitoring recorder (OTMR)) is similar to the flight data recorder found on aircraft. It records data about the operation of train controls and performance in response to those controls and other train control systems.
Data storage is provided by magnetic tape, battery-backed RAM and, most recently, nonvolatile EEPROM or Flash Memory overwritten in a FIFO continuous loop. The data is mainly used in the investigation of accidents and incidents but can also be used to monitor traction unit performance and the competence of drivers.
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In English speaking countries the term event recorder is used in documents requiring their use and defining specifications.
In the United States: From CFR 49 Ch II 229.5 Definitions. (g) Event recorder means a device, designed to resist tampering, that monitors and records data on train speed, direction of motion, time, distance, throttle position, brake applications and operations (including train brake, independent brake, and, if so equipped, dynamic brake applications and operations) and, where the locomotive is so equipped, cab signal aspect(s), over the most recent 48 hours of operation of the electrical system of the locomotive on which it is installed. A device, designed to resist tampering, that monitors and records the specified data.[1]
In Canadian Regulations: Locomotives Design Requirements (Part II) 12. Event Recorders 12.1 Controlling locomotives other than in designated and/or yard service, shall be equipped with an event recorder meeting the following minimum design criteria: The event recorder shall record time, distance, speed, brake pipe pressure, throttle position, emergency brake application, independent brake cylinder pressure, horn signal and Reset Safety Control function. [2]
In the UK the term on-train monitoring recorder (OTMR) is also used in GM/RT 2472 "Design Requirements for Event Recorders on Trains.”
The earliest event recorders were the mechanical TEL (abbreviation of "Telegraphenwerkstätte von G. Hasler")[3] speed recorders of 1891, which recorded both time and speed. [4]
The Federal Railroad Administrations (FRA) "Final Rule 49 CFR Part 229", (revised June 30, 2005) [5][6] requires that Event recorders be fitted to the leading locomotives of all US, Canadian and Mexican trains operating above 30 MPH on the US rail network including all freight, passenger and commuter rail locomotives but does not apply to transit running on its own dedicated tracks.
The new ruling applies to locomotives either ordered before Oct 1, 2006 or placed in service after Oct 1, 2009 and included:
All trains operating on Network Rail controlled infrastructure are required to be fitted with an Event recorder complying with GM/RT 2472.[7] Ireland has also adopted this regulation.
Crash protection requirements:
The UK approach is similar to US requirements, but the list of required signals is more comprehensive. This reflects, in part, the prevalence of passenger trains and the inevitable possibility of incidents involving access doors.
Signals to be recorded include:
Speed recording equipment has been used by Swiss Federal Railways for many years.
France developed the Flaman Speed Indicator and Recorder.