US Railroads use Distributed Power Units to assist in moving trains.
Remote control of DPU are accomplished by radios signals sent from control locomotive to DPUs and confirmation from remote units.
These devices operate on UHF frequencies:Control 452.925, 452.950Mhz, DPU 457.925, 452.950Mhz.
NS Piedmont Division MP 411-420.
Date, Time, Address, Train ID, Pkt Type, Pkt Org
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