ETD

End-of-Train Device

Where this acronym appears

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.
End-of-Train (EOT)
EOT is the operational shorthand for the rear of a freight train consist and for the electronic device — formally called an ETD — that monitors brake-pipe pressure at that location.
End-of-Train Device (ETD)
An ETD is the FRA-mandated unit on the trailing car that monitors brake-pipe pressure and transmits status to the locomotive cab.
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.