Automated Train Control System (ATCS)

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Automated Train Control System (ATCS)
Atcs.png
Frequencies 896.8875896.888 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.897 kHzKiloHertz (kHz) 10^3 Hz
8.968875e-4 MHzMegaHertz (MHz) 10^6 Hz
,936.9875936.988 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.937 kHzKiloHertz (kHz) 10^3 Hz
9.369875e-4 MHzMegaHertz (MHz) 10^6 Hz
0.896 kHzKiloHertz (kHz) 10^3 Hz
8.96e-4 MHzMegaHertz (MHz) 10^6 Hz
0.936 kHzKiloHertz (kHz) 10^3 Hz
9.36e-4 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 896 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).0.896 kHzKiloHertz (kHz) 10^3 Hz
8.96e-4 MHzMegaHertz (MHz) 10^6 Hz
- 936 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).0.936 kHzKiloHertz (kHz) 10^3 Hz
9.36e-4 MHzMegaHertz (MHz) 10^6 Hz
Mode NFMNarrowband Frequency Modulation
Modulation FSKFrequency-Shift Keying
ACF
Bandwidth 12500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).12.5 kHzKiloHertz (kHz) 10^3 Hz
0.0125 MHzMegaHertz (MHz) 10^6 Hz
12.5 kHzKiloHertz (kHz) 10^3 Hz
0.0125 MHzMegaHertz (MHz) 10^6 Hz
12.5 kHzKiloHertz (kHz) 10^3 Hz
0.0125 MHzMegaHertz (MHz) 10^6 Hz
Location North America
Short Description Automated Train Control System (ATCS), specifically ATCS Spec. 200, is a standardized communication system for railroads designed to ensure safety by monitoring locations of trains and locomotives, providing analysis and reporting, and automation of track warrants and similar orders.
I/Q Raw Recording Download file
Audio Sample

Description[edit]

ATCS Specification 200 is a standardized communication system for railroads designed to ensure safety by monitoring locations of trains and locomotives, providing analysis and reporting, and automation of track warrants and similar orders.

  • STRUCTURE: ISO 7 Layer, Synchronous HDLC-LAPB
  • MAX BIT RATE: 4800 bpsBits per second (bps)
  • FREQ BAND: UHFUltra High Frequency (300-3000 MHz), 900 MHzMegaHertz (MHz) 10^6 Hz duplex
  • MODULATION: FSKFrequency-Shift Keying Baseband/Direct FMFrequency Modulation
  • RADIO MFGR(s): Safetran, Harris, others.
  • COMMS RANGE: LOS
  • COMMS BETWEEN: base site, wayside, vehicle,

Samples[edit]


Frequencies[edit]

CH # Mobile Control Point (MCP) Base Control Point (BCP) Rail Company
1 896.8875 935.8875 Union Pacific
2 896.9375 935.9375 CSX
3 896.9875 935.9875 Shared ATCS Network
4 897.8875 936.8875 BNSF
5 897.9375 936.9375 Norfolk Southern
6 897.9875 936.9875 Southern Pacific

Decoding Software[edit]

Hobby Level Software

ATCS Monitor Example[edit]

Main Display Screenshot
Dispatcher Display Screenshot

Sample Packet data...

Wayside Device - RFRadio Frequency: 5125013826 (N Wapakoneta)
2016/04/08 06:59:40
CO Datagram (1) Inbound to Ground Network (35)
Frame=34 GFI=2 Group=5 SSeq=77 Rseq=45 Beacon=0 Vital=0 UsrData=6
To Dispatch: 2125385538
Number=2.3.2 CODELINE_INDICATION_MSG
Mnemonics=1NWK,2NWK

02 04 05 00 00 00 ......

Additional Links[edit]

Additional Images[edit]