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Railway Signal and Telecommunication Chapter 18
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Railway Signal and Telecommunication Chapter 18

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Questions and Answers

What is the primary purpose of using Multi Section Digital Axle Counters (MSDACs) in intermediate block signalling?

  • To exchange signalling information between stations and intermediate block sections (correct)
  • To detect track vacancy in only rear sections
  • To minimize signalling and quad cables with no RE cut sections in between
  • To provide duplicate axle counters for track vacancy detection

    • What is a potential issue with conventional IB signalling that uses SSDACs without duplication?

  • Intermittent failures leading to system unavailability (correct)
  • Higher probability of track vacancy detection
  • Inaccessibility of location boxes for maintenance
  • Difficulty in exchanging signalling information

    • What is the purpose of using dual detection with redundancy at each level in the presented scheme?

  • To reduce the probability of failure (correct)
  • To provide duplicate axle counters for track vacancy detection
  • To minimize signalling and quad cables with no RE cut sections in between
  • To increase the number of location boxes

    • What is the primary function of axle counters in intermediate block signalling?

    <p>To detect track vacancy in rear and advance sections</p> Signup and view all the answers

    What is the purpose of using Multiplexing facilities of MSDAC in the presented scheme?

    <p>To exchange signalling information between stations and intermediate block sections</p> Signup and view all the answers

    Why are location boxes used in conventional IB signalling?

    <p>To terminate signalling and power cables</p> Signup and view all the answers

    What is a limitation of conventional IB signalling that uses location boxes?

    <p>Inaccessibility of location boxes for maintenance</p> Signup and view all the answers

    What is the advantage of using MSDACs over SSDACs in intermediate block signalling?

    <p>MSDACs minimize signalling and quad cables with no RE cut sections in between</p> Signup and view all the answers

    What is the primary purpose of the Token Balance Book in the Signal and Telecommunication Department?

    <p>To maintain a record of token quantities in use on a section</p> Signup and view all the answers

    What is the significance of the 'Serial No.of Token Lost' column in the Line Clear Pick Up Apparatus?

    <p>It provides a record of tokens lost during transit</p> Signup and view all the answers

    What is the purpose of the 'Signature and remarks of SSE/JE (Signal)' column in the Line Clear Pick Up Apparatus?

    <p>To verify the installation of block instruments</p> Signup and view all the answers

    What is the function of the 'Post' in the Line Clear Pick Up Apparatus?

    <p>To provide a visual indication of white color</p> Signup and view all the answers

    What is the significance of the 'Block Section' in the Token Balance Book?

    <p>It is used to identify the section of rail traffic management</p> Signup and view all the answers

    What is the primary purpose of the 'Fittings' in the Line Clear Pick Up Apparatus?

    <p>To provide a visual indication of black color</p> Signup and view all the answers

    What is the significance of the 'Date of Installation' column in the Line Clear Pick Up Apparatus?

    <p>It is used to track the installation date of block instruments</p> Signup and view all the answers

    What is the purpose of the 'Tokens Lost/Tablets Lost' annexure in the Line Clear Pick Up Apparatus?

    <p>To provide a record of tokens lost during transit</p> Signup and view all the answers

    What is the primary function of the Audible Indicator in Non-Co-operative type Instruments?

    <p>To warn the receiving station when the train enters the block section at the sending station</p> Signup and view all the answers

    What is the primary purpose of provision of MSDACs in track vacancy detection?

    <p>To define the boundaries of track sections</p> Signup and view all the answers

    What is the significance of dual detection in IBS?

    <p>To provide redundancy in wheel sensor detection</p> Signup and view all the answers

    What is the purpose of Track circuits or Axle Counters in block sections?

    <p>To detect the presence of a train in the block section</p> Signup and view all the answers

    What is the requirement for the instruments in Non-Co-operative type Instruments?

    <p>Automatic 'Train On Line' position is set by the entry of the train into the block section</p> Signup and view all the answers

    What is the typical layout of the placement of different DPs and Signals in IBS?

    <p>UP and DOWN IB signals are placed near the Relay hut</p> Signup and view all the answers

    What is the function of the indicator in each block station?

    <p>To show whether the block section is occupied or not</p> Signup and view all the answers

    What is the nomenclature of DPs in the DOWN direction?

    <p>DN-DP1A, DN-DP1B, DN-DP2A, DN-DP2B</p> Signup and view all the answers

    What is the purpose of Shunting Keys in Non-Co-operative type Instruments?

    <p>To provide an authority for shunting in the block section</p> Signup and view all the answers

    What is the purpose of the Relay hut in IBS?

    <p>To cater for RBG room at IB location</p> Signup and view all the answers

    What is the condition required for the instruments to be set to 'Line Closed' condition?

    <p>The train has passed the Home Signal at the receiving station</p> Signup and view all the answers

    What is the significance of Fig 2 in the context of IBS?

    <p>It shows the boundaries of track sections</p> Signup and view all the answers

    What is the typical IBS section composed of?

    <p>Three track sections in each direction</p> Signup and view all the answers

    What is the requirement for the Audible Indicator in block instruments?

    <p>It is required to warn the receiving station when the train enters the block section at the sending station</p> Signup and view all the answers

    Why are MSDACs provided in IBS?

    <p>To define track section boundaries and detect track vacancy</p> Signup and view all the answers

    What is the primary function of the Automatic 'Train On Line' position in Non-Co-operative type Instruments?

    <p>To ensure the instruments are set to 'Train On Line' position automatically by the entry of the train into the block section</p> Signup and view all the answers

    What is the primary function of the rear section in Intermediate Block Signalling?

    <p>To monitor track sections using Axle Counter or Track circuit</p> Signup and view all the answers

    What is a critical consideration for the placement of Intermediate Block Signalling (IBS) at the point of near bifurcation?

    <p>Presence of steeper gradients on the approach of the IBS</p> Signup and view all the answers

    What is the purpose of providing a 400 meters block overlap in the rear section?

    <p>To provide a buffer zone in case of axle counter failures</p> Signup and view all the answers

    What is the function of the LSS of the rear station in Intermediate Block Signalling?

    <p>To control train entry into the rear section</p> Signup and view all the answers

    What is the purpose of providing a Signal Post Telephone (SPT) at the IBS post?

    <p>To provide communication with the station in the rear</p> Signup and view all the answers

    What is a potential issue with the use of single detection in Intermediate Block Signalling?

    <p>Increased risk of axle counter failures</p> Signup and view all the answers

    What is the primary consideration for the placement of the IBS at the point of near bifurcation?

    <p>Presence of steeper gradients on the approach of the IBS</p> Signup and view all the answers

    What is the function of the IBS in controlling train entry into the advance section?

    <p>To control train entry into the advance section</p> Signup and view all the answers

    Study Notes

    Block Instruments, BPAC, and IBS Working

    • Post and fittings are marked with white and black colors respectively.
    • Tokens lost or tablets lost are recorded with railway, block section, division, station, and other details.
    • Token balance book is maintained to record token losses and new tokens used.
    • MSDACs (Multi Section Digital Axle Counters) are used for track detection and exchange of signaling information.

    Intermediate Block Signaling

    • IBS consists of two major components: track vacancy detection and exchange of signaling and reset information.
    • Dual detection with redundancy at each level, including communication media, is adopted to achieve higher availability.
    • Track vacancy detection is achieved through MSDACs, and exchange of signaling information is done using multiplexing facilities.
    • Audible indicators are used to warn the receiving station when the train has passed the home signal and the sending station when the train has passed the last stop signal.

    Non-Cooperative Type Instruments

    • Automatic "Train On Line" is provided to ensure the instruments are set to "Train On Line" position automatically.
    • Audible indicators are used to warn the receiving station when the train enters the block section.
    • Shunting keys are provided for use as an authority for shunting in the block section.

    Train Detection for Proving Block Section to be Clear

    • Track circuits or axle counters are used to prove the block section to be clear.
    • An indicator is provided in each block station to show whether the block section is occupied or not.

    Typical Layout of IBS

    • The typical layout of IBS consists of a relay hut, IB home signals, and distant signals.
    • The nomenclature of DPs in the DOWN direction is DN-DP1A, DN-DP1B, DN-DP2A, DN-DP2B, etc.
    • A similar nomenclature is adopted for the UP direction.

    Provision of MSDACs for Track Vacancy Detection

    • MSDACs are used to define the boundaries of track sections and supervisory track sections.
    • Dual detection has been provided with redundancy for all equipment and communication media.

    Intermediate Block Signalling (IBS) General Requirements

    • IBS is used to increase section capacity by splitting a long block section into two portions.
    • The rear section starts from the LSS of the rear station and ends at the IBS including a 400-meter block overlap.
    • The advance section starts from the IBS and ends at the home signal of the advance station including a block overlap.
    • Track sections are monitored either by axle counters or track circuits.
    • Train entry into the rear section is controlled by the LSS of the rear station.
    • Train entry into the advance section is controlled by the IBS.
    • A signal post telephone or approved type communication is provided at the IBS post for communication with the station in the rear.

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    Related Documents

    CH 18.pdf

    Description

    This quiz is based on chapter 18 of the Railway Signal and Telecommunication book, covering topics such as Block Instruments, BPAC, and IBS working.

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