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Railway Audio Frequency Track Circuits – Railway ...

    https://www.railwaysignallingconcepts.in/railway-audio-frequency-track-circuits/#:~:text=It%E2%80%99s%20a%20type%20of%20AC%20track%20circuit%20in,used%20in%20ac%2C%20dc%2C%20and%20non%20electrified%20areas.
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US3345512A - Audio frequency overlay detector track ...

    https://patents.google.com/patent/US3345512A/en

    AND INSTALLATION, APPLICATION OF AUDIO FREQUENCY …

      https://globalproductssupport.sts.hitachirail.com/productsegments/waytrainsep/servicemanuals/usa/public/5906.pdf
      The term "Audio Frequency" has been applied to this type' of equipment because it makes use of frequencies within the audio range (20-20,000 Hz). 1. Track Circuit Operation An. AFO track circuit is composed of a transmitter receiver, and receiver relay. The transmitter and receiver require a de power supply for operation.

    AUDIO FREQUENCY OVERLAY SYSTEM - Hitachi Rail

      https://globalproductssupport.sts.hitachirail.com/productsegments/waytrainsep/servicemanuals/usa/public/6414-generic.pdf
      Audio Frequency Overlay (AFO) equipment is designed to provide a vital train detection function. This function is added to the train detection capabilities already present in the system, but it does not require additional insulated joints. The term “audio frequency” is used because it refers to frequencies within the 20-28,000 Hz range.

    Track Circuits | Signaling, On-board and Crossing …

      https://www.mobility.siemens.com/us/en/portfolio/rail/automation/signaling-on-board-and-crossing-products/track-circuits.html

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