US Railroads use EOT/HOT devices to monitor status of the last car in a train.
Brake pressure, movement, and battery status are shown on an HOT display in the cab.
These devices operate on UHF frequencies EOT 457.9375Mhz, HOT 452.9375Mhz.
HOT/EOT are paired by a unique ID when a train is assembled.
NS Piedmont Division MP 411-420.
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