Event Recorder
An event recorder is the FRA-mandated onboard data logger that continuously captures locomotive operating parameters — speed, throttle, brake applications, and signal status — for post-incident analysis.
An event recorder is the federally mandated data acquisition device installed on every locomotive operating in road service, required under FRA regulations (49 CFR Part 229). It continuously captures a defined set of locomotive operating parameters at regular intervals, including speed, throttle position, independent and automatic brake applications, horn activations, alerter status, cab signal data, and — on PTC-equipped locomotives — additional control system inputs. The data is stored on a crash-hardened module designed to survive derailments and fire. Event recorder data is the first resource investigators access following a train accident or rule violation: the time-stamped record of exactly what the locomotive was doing in the minutes and seconds before an incident. FRA regulations specify the minimum parameters that must be recorded, the data retention period, and the download and inspection requirements. Modern event recorders are increasingly integrated with onboard video systems, allowing investigators to correlate the data record with synchronized camera footage from the same moment.
The event recorder is the locomotive's black box. In any post-incident investigation — whether it's a derailment, a grade crossing collision, a signal violation, or an operational rule infraction — the event recorder data establishes the objective timeline of what the locomotive did. That data is discoverable in litigation and subject to FRA download authority following accidents. The value of pairing event recorder data with onboard video from locomotive camera systems is significant: the recorder tells you the speed was 47 mph at a 25 mph restriction; the camera shows you what the engineer was doing and what was visible through the windshield at that moment. Together they provide a complete picture that neither source delivers alone.
Event recorder data affects you most when something goes wrong. In normal operations, the recorder runs silently in the background and you never think about it. After a rough coupling move, a signal violation, or an emergency application, the knowledge that the recorder captured everything focuses your account of events. Downloading the recorder after an incident is a standard investigative step — the data doesn't wait for your version of events, and it doesn't forget.
Solutions
Products
- rail-one-ldvr
Onboard L-DVR operating alongside the event recorder, providing synchronized video to complement the data record.
- firebox-one
Crash-hardened backup recorder that preserves video through the same severe events the event recorder is designed to survive.
- crash-hardened-enclosure
Protective enclosure for the RAIL-One DVR in installations where crash survivability is a requirement.
- Locomotive
A locomotive is the self-propelled power unit that generates tractive effort to move a train consist over a railroad.
- Positive Train Control (PTC)
PTC is the FRA-mandated system that automatically enforces speed restrictions and prevents train-to-train collisions, over-speed derailments, and unauthorized incursions into work zones.
- Dynamic Braking
Dynamic braking is a braking mode in which a locomotive's traction motors are switched to act as generators, converting kinetic energy into electrical resistance and providing controlled retardation without applying the air brake system.
- Train Consist
A train consist is the complete ordered inventory of locomotives and cars that make up a train, used for crew briefing, air brake testing, and operational planning.
- Distributed Power Unit (DPU)
A DPU is a locomotive cut into the middle or rear of a long freight train and controlled remotely from the lead unit to distribute tractive and braking effort along the consist.
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