Not sure where to post this but i updated under Texas. Union Pacifc in Austin, TX has changed from 160.74 to 160.83. I Wonder why??
From a friend:
They used to have a phone patch system, which they called a PBX, but I think they don't use that around Austin anymore. I think BNSF may still use their PBX system, but BN doesn't get that close to Austin.
The UP "road" frequency on 160.830 does use a 3 DTMF tone sequence to call the dispatcher, but not a "phone path." The 3 tones activate the nearest radio tower and connects it to the dispatcher, and makes some sort of signal on the dispatcher's console in the dispatch center in Omaha. It's sort of a phone patch, but it only connects to the dispatcher.
You'll hear three DTMF tones, and then a long tone in response. Then you'll hear the dispatcher come on the air. Different segments of the railroad network use different DTMF codes so you don't ring up the dispatcher on some distant segment of track when there's ducting.
Apparently, the train has to dial up the 3 tones on a DTMF mike like we do.
I think that 911 actually works on all of the radio towers and signals the dispatcher that it's an emergency call.
They changed the DTMF call code when they changed the frequency last week. I don't know what the number is, but I can tell it's different.
From a friend:
They used to have a phone patch system, which they called a PBX, but I think they don't use that around Austin anymore. I think BNSF may still use their PBX system, but BN doesn't get that close to Austin.
The UP "road" frequency on 160.830 does use a 3 DTMF tone sequence to call the dispatcher, but not a "phone path." The 3 tones activate the nearest radio tower and connects it to the dispatcher, and makes some sort of signal on the dispatcher's console in the dispatch center in Omaha. It's sort of a phone patch, but it only connects to the dispatcher.
You'll hear three DTMF tones, and then a long tone in response. Then you'll hear the dispatcher come on the air. Different segments of the railroad network use different DTMF codes so you don't ring up the dispatcher on some distant segment of track when there's ducting.
Apparently, the train has to dial up the 3 tones on a DTMF mike like we do.
I think that 911 actually works on all of the radio towers and signals the dispatcher that it's an emergency call.
They changed the DTMF call code when they changed the frequency last week. I don't know what the number is, but I can tell it's different.
Union Pacific Freq Change Austin 160.83
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