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PBX is a sort of phone. The Pbx channel will give dial tone so a crew can get a land line and dial out. I've seen guys on helper locos dial out and order pizza. The company gets a little stizzed when they catch you on the PBX (Moraz) screwing around. I use it in the yard to call the tower on their phone instead of tying up the radio channel if I know that my conversation will be lengthy. I don't know what RTC is, but I am curious.
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