VHF Communication Procedures for TFC
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Questions and Answers

What is the first step a Station Master must take when line communication systems are found defective?

  • Notify all train crews of the communication failure
  • Switch on the Main Switch of the wireless set (correct)
  • Wait for an hour before switching on the wireless set
  • Immediately contact the other Station Master

During the Total Failure of Communications, what must a Station Master communicate to the other end?

  • The names of the passengers aboard
  • The weather conditions affecting train operations
  • Identity of the train crew members
  • The train numbers passed before the interruption (correct)

What is a key feature of the wireless communication system mentioned?

  • It requires an open channel without any user restrictions.
  • It does not require any identification numbers.
  • It allows multiple Station Masters to talk at once.
  • It is a simplex system where only one Station Master can talk at a time. (correct)

In addition to the train number, what other information is required in the train passing messages?

<p>The identity of the Station Master and Private Numbers (B)</p> Signup and view all the answers

How long should the Station Master wait before turning on the wireless set?

<p>One minute (B)</p> Signup and view all the answers

What should a Station Master do immediately after finishing a message?

<p>Release the Pressel Switch (D)</p> Signup and view all the answers

What must be included in the Permission To Approach for train communications?

<p>An Identification Number for each train (B)</p> Signup and view all the answers

Which channel is designated for the first section during Total Failure of Communications?

<p>Channel 5 (A)</p> Signup and view all the answers

What frequency is associated with Channel 6?

<p>159.600 MHZ (C)</p> Signup and view all the answers

How are the two parts of the Identification Number sheets differentiated during the issue?

<p>By the numbering system applied (D)</p> Signup and view all the answers

What is the frequency for Channel 7?

<p>151.400 MHZ (B)</p> Signup and view all the answers

Which channel should be reverted to after Total Failure of Communications is over?

<p>Channel 2 (A)</p> Signup and view all the answers

What is the role of Sr.DOM / Sr.DOM(G) in the issuance of Identification Number sheets?

<p>To sign and date the sheets (D)</p> Signup and view all the answers

How many frequencies are allocated for taking Line Clear on VHF sets during Total Failure of Communications?

<p>3 frequencies (C)</p> Signup and view all the answers

Which channel is used for the second adjoining section during Total Failure of Communications?

<p>Channel 6 (D)</p> Signup and view all the answers

What information is contained in the left half of the Identification Number sheet?

<p>Station names with identifiers (B)</p> Signup and view all the answers

What is the purpose of issuing Identification Number sheets?

<p>To track communication interruptions (B)</p> Signup and view all the answers

How many Identification Number sheets are issued for each adjoining block section?

<p>Two (D)</p> Signup and view all the answers

What happens to the Identification Number sheet after communication is restored?

<p>It must be sent back immediately (D)</p> Signup and view all the answers

What is indicated on the envelope containing the Identification Number sheet?

<p>The section and relevant cover number (C)</p> Signup and view all the answers

How many Identification Number sheets are issued to stations with VHF sets used in quick succession?

<p>Five (B)</p> Signup and view all the answers

What does the Sr.DOM / Sr.DOM(G)/ DOM(G) need to prepare for the Kalyani-Madanpur section?

<p>Two Identification Number sheets (D)</p> Signup and view all the answers

What is the process for separating the Identification Number sheets?

<p>Each sheet is torn in half (C)</p> Signup and view all the answers

After the Identification Number sheets are issued, where are they sent?

<p>To the station master (D)</p> Signup and view all the answers

Which sections are covered by each Identification Number sheet in the example given?

<p>Kalyani and Madanpur (C)</p> Signup and view all the answers

What is confirmed when the covers containing the halves of the sheets are numbered?

<p>The sequence of handling is maintained (A)</p> Signup and view all the answers

What must be done with the entry once 'Permission to Approach' has been obtained?

<p>It must be recorded in the Train Signal Register and the Line Clear Ticket. (D)</p> Signup and view all the answers

What should be done when an Identification Number sheet is exhausted during an interruption?

<p>It should be returned immediately to the Sr.DOM. (B)</p> Signup and view all the answers

How should an Identification Number sheet be secured once opened?

<p>It must be kept under lock and key. (D)</p> Signup and view all the answers

What is the role of the Sr.DOM when an interruption occurs?

<p>To send out fresh Identification Number sheets without delay. (A)</p> Signup and view all the answers

What should happen to a partly used Identification Number sheet after an interruption?

<p>It must be returned to the Sr.DOM after the interruption. (D)</p> Signup and view all the answers

What should Madanpur do if he wishes to send an Up train to Kalyani during total communication interruption?

<p>Call Kalyani on the telephone to open sealed envelope no. 1. (A)</p> Signup and view all the answers

What is Kalyani's responsibility after receiving the initial identification letter and figure from Madanpur?

<p>Verify the identification number and signal that he is ready to receive. (C)</p> Signup and view all the answers

What must happen before Madanpur sends the Is Line Clear signal?

<p>Kalyani must provide his private numbers to Madanpur. (D)</p> Signup and view all the answers

What should each station master do immediately after a train's identification number is used?

<p>Record the number and date against the identification number. (D)</p> Signup and view all the answers

What should Kalyani do if the section is clear after receiving Madanpur's Is Line Clear signal?

<p>Provide permission to approach and mention the corresponding identification number. (C)</p> Signup and view all the answers

What is the significance of the identification numbers used in these communications?

<p>They ensure proper sequential identification for subsequent trains. (C)</p> Signup and view all the answers

Under what circumstance can VHF sets be used between Madanpur and Kalyani?

<p>During total interruption of communications. (B)</p> Signup and view all the answers

What must Kalyani do after he verifies the identification letter and figure from Madanpur?

<p>Communicate immediately that he is ready to receive. (A)</p> Signup and view all the answers

What should happen during the inquiry message sent by Madanpur?

<p>It must end with the identification letter and figure. (D)</p> Signup and view all the answers

In communication between the stations, what should Kalyani avoid doing?

<p>Reading out his own identification letter and figure. (B)</p> Signup and view all the answers

What is the primary function of the Pressel Switch during communications between Station Masters?

<p>To signal the end of a message. (D)</p> Signup and view all the answers

During a Total Failure of Communications, what is the reason for the Station Master to check train numbers and timings?

<p>To ensure correct communication between stations. (B)</p> Signup and view all the answers

Which specific limitation of the wireless communication system is highlighted in the rules?

<p>Only one Station Master can speak at a time. (D)</p> Signup and view all the answers

What information must be included in the train passing messages during TFC?

<p>Identity of the Station Master and train number. (A)</p> Signup and view all the answers

What configuration must be maintained by the wireless sets during the communication failure?

<p>They remain switched on until line communication is restored. (B)</p> Signup and view all the answers

What specific term indicates the conclusion of messages transmitted through the wireless communication system?

<p>OVER (C)</p> Signup and view all the answers

What should be done to establish communication after line systems are found inoperative?

<p>Immediately switch on the wireless sets at both ends. (A)</p> Signup and view all the answers

What must be done with an Identification Number sheet that is only partly used during an interruption?

<p>It should be returned to the Sr.DOM for checking. (B)</p> Signup and view all the answers

How should the Station Master ensure the security of Identification Number sheets once opened?

<p>Keep them in his possession or under lock and key. (C)</p> Signup and view all the answers

What is the responsibility of the Sr.DOM / Sr.DOM(G) upon receiving used Identification Number sheets?

<p>Destroy them after ensuring they match with their corresponding halves. (D)</p> Signup and view all the answers

What should a Station Master do if an interruption requires an Identification Number sheet?

<p>Keep the envelope unopened until absolutely necessary. (A)</p> Signup and view all the answers

What is a critical action required when an Identification Number sheet is exhausted during an interruption?

<p>Return it along with any partly used sheets to the Sr.DOM. (A)</p> Signup and view all the answers

What action should a Station Master take after completing communications during Total Failure of Communications?

<p>Revert back to channel 2 after TFC. (A)</p> Signup and view all the answers

Which combination best represents the usage sequence of the channels during Total Failure of Communications?

<p>Channel 5, Channel 6, Channel 7, Channel 5, Channel 6 (D)</p> Signup and view all the answers

What is the first step that must be taken before issuing the left and right halves of the Identification Number sheets?

<p>Write the names of the two stations over the columns. (D)</p> Signup and view all the answers

How are the column sections organized within each part of the Identification Number sheet?

<p>Both sections contain the same letters and figures but in different orders. (C)</p> Signup and view all the answers

What specific characteristics are common to the frequencies assigned for Line Clear communications during Total Failure of Communications?

<p>They are designated for specific sections with identifiable frequency ranges. (C)</p> Signup and view all the answers

What must the Sr.DOM or other designated personnel do after writing the names on the Identification Number sheets?

<p>Sign and date the halves before distribution. (B)</p> Signup and view all the answers

Which of the following best describes the frequency assigned to Channel 5?

<p>160.550 MHZ (B)</p> Signup and view all the answers

What is indicated by the identical numbers on the columns of the Identification Number sheet?

<p>They match the data entries between both halves. (C)</p> Signup and view all the answers

What frequency corresponds to Channel 6 during Total Failure of Communications?

<p>159.600 MHZ (C)</p> Signup and view all the answers

What is the maximum number of Identification Number sheets that can be issued for an adjoining block section?

<p>Two sheets (A)</p> Signup and view all the answers

What should be done with the Identification Number sheet as soon as other means of communication are restored?

<p>Return it immediately to the Sr.DSO (A)</p> Signup and view all the answers

How are the envelopes containing the Identification Number sheets marked?

<p>With a number and the section name (C)</p> Signup and view all the answers

What is the significance of having each half of the Identification Number sheet signed and dated?

<p>To validate authenticity and record the issuance (B)</p> Signup and view all the answers

In the described process, how many Identification Number sheets are specifically prepared for stations with VHF sets used in quick succession?

<p>Five sheets (C)</p> Signup and view all the answers

What happens to the halves of the Identification Number sheets after they are separated?

<p>Each half is placed in a sealed envelope (D)</p> Signup and view all the answers

What information is NOT included in the covers containing the Identification Number sheets?

<p>The current date (C)</p> Signup and view all the answers

How is the task of issuing Identification Number sheets characterized during a communication breakdown?

<p>As a standardized protocol (D)</p> Signup and view all the answers

What is the importance of the endorsements made on the envelopes containing the Identification Number sheets?

<p>To track the movement of sheets between stations (D)</p> Signup and view all the answers

Which of the following best describes the physical handling of the Identification Number sheets?

<p>They are separated and secured in envelopes (A)</p> Signup and view all the answers

What should Madanpur do to verify that Kalyani is ready to receive the Up train?

<p>Wait for Kalyani to confirm readiness without providing his own identification (A)</p> Signup and view all the answers

What does Kalyani need to verify after receiving Madanpur's identification letter and figure?

<p>Check it against his list for accuracy (C)</p> Signup and view all the answers

During communication interruption, what follows after Kalyani gives Permission to Approach?

<p>Madanpur will send the Line Clear message (C)</p> Signup and view all the answers

What should Madanpur enter in the Line Clear Ticket once he receives Kalyani's identification number?

<p>Kalyani's identification number along with Private Numbers (B)</p> Signup and view all the answers

What does Kalyani need to do immediately after sending the Line Clear message?

<p>Take note of the private numbers used (B)</p> Signup and view all the answers

What is required from each station master concerning the identification numbers used?

<p>Enter the number and date of the train against each identification number immediately (A)</p> Signup and view all the answers

What must happen before Kalyani can communicate the Is Line Clear signal to Madanpur?

<p>Kalyani must verify the section is clear (D)</p> Signup and view all the answers

What should each station do to manage subsequent trains during communication interruptions?

<p>Obtain a new identification number each time in a serial manner (B)</p> Signup and view all the answers

What is the main reason for using identification letters and figures in the permission messages?

<p>To ensure the authenticity of the communication (A)</p> Signup and view all the answers

Flashcards

VHF Set Use During Communication Failure

Wireless sets should be used for train passing communications when the main communication lines (like telephones) are not working.

Initial Communication Procedure

Station Masters must wait a minute for the wireless set to warm up, then check with the other end about the train details. (e.g., passing train numbers and times) before issuing any further communications.

Communication Interruption Data

The station master must record and share the details of incoming and outgoing train information before the interruption to ensure that the station is communicating with the right stations, during temporary communication interruptions.

Simplex Communication

In simplex communication, only one person can speak at a time.

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Communication System Status Post Interruption

The wireless communication system should remain active until the regular communication lines are back in service.

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Train Passing Messages During Failure

All train-related messages must be exchanged via the wireless system when the primary lines are unavailable.

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Required Train Communication Information

Train passing messages must include identity of the station master, train number, and private numbers.. Permission to approach is required for each train.

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TFC Channels

Three specific radio frequencies (Channel 5, 6, and 7) are designated to use in case of a total communication failure (TFC).

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TFC Procedure

In a TFC situation, Channel 5 is used for the first section, Channel 6 for the second section, and Channel 7 for the third. This pattern continues for subsequent sections.

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Returning to Regular Operations

Once the TFC is over, the Station Master must switch back to using Channel 2 for normal communication.

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Identification Numbers

Each Block station uses a unique set of two identification number sheets, each divided into two parts, containing combinations of letters and figures.

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Sheet Distribution

The left half of each sheet goes to one station at the start of a Block section, while the right half goes to the station at the end of the same section.

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Sheet Preparation

Before issuing the sheets, the Sr.DOM (or equivalent) writes the names of the two stations associated with the sheet at the head of the columns.

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Sheet Signing

Before being sent out, both halves of the sheet are signed and dated by the Sr.DOM (or equivalent).

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Purpose of Identification Numbers

These unique combinations of letters and figures are used to obtain permission for trains to proceed within a Block section.

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Number Sheet Maintenance

Each block station is responsible for maintaining the two identification number sheets assigned to them.

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Identification Number Sheet

A document used to track train passing information during communication interruptions. It's divided into two parts, one for each station involved.

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Sr. DOM/Sr.DOM(G)/ DOM(G)

The Senior Divisional Operations Manager (DOM) is responsible for issuing and managing the Identification Number Sheets.

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Two Identification Number Sheets Per Section

Each station receives two Identification Number Sheets for each adjoining block section to ensure redundancy in case one sheet gets lost or damaged.

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Station Master's Role

The Station Master is responsible for endorsing the Identification Number Sheet with the train information and sending it to the other station involved.

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Returning the Sheet

Once regular communication is restored, the Identification Number Sheet is returned to the Sr.DOM/Sr.DOM(G)/ DOM(G) for replacement.

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VHF Sets in Quick Succession

Stations using VHF sets frequently receive five Identification Number Sheets to avoid delays in getting new sheets.

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Example: Kalyani-Madanpur Section

The Sr.DOM/Sr.DOM(G)/ DOM(G) prepares two sheets with station names and signs them. Each half is put in a separate sealed envelope, numbered and sent to the respective stations.

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What information is on the sheet?

The Identification Number Sheet records details like the train number, passing time, and station names involved.

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Why is the sheet sealed?

The sealed envelope ensures the integrity and authenticity of the information on the Identification Number Sheet.

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Who has access to the sheet?

The Station Master has complete control over the Identification Number Sheet for his station and shares it only with the other station involved in train passing information.

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Train Signal Register

A log where Station Masters record details of 'Permission to Approach' granted using VHF sets due to communication disruptions.

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How is the ID Sheet used?

A new ID Number sheet is distributed for each communication disruption. Once used, the sheet is returned and destroyed to prevent misuse.

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Who manages the ID Sheets?

The Senior DOM (Divisional Operating Manager) oversees the issuance and disposal of ID sheets, ensuring proper usage and security.

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Station Master's Responsibility

Station Masters are responsible for secure storage of ID sheets and ensure they're only used during communication interruptions.

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What happens when communication is interrupted?

If communication is interrupted, stations use VHF sets for train passing, following a specific procedure.

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Who initiates the procedure?

The station requesting to dispatch a train (Madanpur in the example) initiates the procedure by contacting the other station (Kalyani).

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What's the first step after contacting the other station?

The initiating station (Madanpur) informs the other station (Kalyani) about opening a sealed envelope containing the identification codes.

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What happens after opening the envelope?

Kalyani calls Madanpur and requests the first identification code from Madanpur's list.

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How is identification checked?

Kalyani checks the code received from Madanpur against his own list and confirms if it matches.

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When is the 'Is Line Clear' signal sent?

Once Kalyani confirms the code, Madanpur immediately sends the 'Is Line Clear' signal.

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What's the role of the first identification code?

The first identification code is used to ensure the communication is secure and validated.

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What happens after the 'Is Line Clear' signal?

Kalyani gives 'Permission to Approach' and includes his own identification number.

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How is the second station's code used?

Madanpur verifies the second station's identification number and enters it on the Line Clear Ticket for record keeping.

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What's the procedure for subsequent trains?

Each station requesting 'Permission to Approach' provides their identification number in sequence, and the other station responds with their own number.

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VHF Sets for TFC

When communication lines are down, VHF sets are used for train passing work to ensure safe operations.

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TFC Communication Checklist

After activating VHF, the Station Master must verify train details (numbers, timings, and private numbers) with the other Station Master to ensure they're communicating with the right station.

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VHF Set Warm-up

Before using VHF sets, Station Masters must wait at least one minute for the sets to warm up and become operational.

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Communication Restoration

The VHF communication system stays active until the regular communication lines are restored.

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Train Passing Messages

All train-related messages, such as permission to approach, must be transmitted on the VHF system when normal communication fails.

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Returning to Normal Operations

Once the TFC is over, the Station Master must switch back to using Channel 2 for normal communication.

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How are ID sheets used?

During a communication disruption, each station involved opens their sealed ID sheet envelope and uses the unique combinations of letters and numbers to verify and grant permission for trains to proceed through the block section.

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What does "TFC" stand for?

TFC stands for "Total Failure of Communication". This is a critical situation where regular communication lines are down, and stations need alternative methods to ensure safe train operations.

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What is the primary purpose of using VHF sets during TFC?

VHF sets are used to communicate between stations during TFC, enabling them to exchange train passing information and ensure train movement safety, even without regular communication lines.

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What is an Identification Number?

An Identification Number is a unique code, a combination of letters and figures, used to verify the identity of stations and trains during TFC. It's like a secret handshake.

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How are Identification Numbers used in TFC?

Stations exchange Identification Numbers to verify each other's identity and authorize trains to proceed. This helps ensure that the correct train passes the correct section.

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What is the role of the Sealed Envelope?

The Sealed Envelope contains the Identification Numbers for a particular section. The Station Master opens it during TFC and uses the numbers to communicate with the adjacent station.

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What are the two main steps in initiating TFC communication?

The first step is calling the other station and informing them about opening the Sealed Envelope with Identification Numbers. The second step is requesting the other station to check and verify the Identification Number mentioned.

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How does the 'Is Line Clear' signal work during TFC?

The 'Is Line Clear' signal is sent by the station dispatching the train (Madanpur in the example), confirming it's safe for the train to proceed. This signal is given after verifying the identity of the receiving station through the Identification Number.

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What is the purpose of the 'Permission to Approach' signal?

The 'Permission to Approach' signal is given by the station receiving the train (Kalyani) to the sending station (Madanpur), indicating the section is clear for the train to proceed.

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How are subsequent trains handled during TFC?

For subsequent trains, each station requesting permission to approach gives their Identification Number in sequence, and the other station responds with their corresponding number, continuing the process of verification.

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How does the 'Line Clear Ticket' work?

The 'Line Clear Ticket' is a record of the Identification Numbers used for train passing during TFC. This ticket is used for tracking and verifying the train movements in case of communication failure.

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Study Notes

Appendix A: Rules for VHF Sets During Total Communication Failure (TFC)

  • VHF Use During TFC: Wireless sets used as communication during communication system failures.
  • Initiating Communication: Station Masters "switch on" wireless sets, wait one minute for warm-up. Check with other station for train numbers and times immediately before interruption. Use preset switch for identification.
  • Maintaining Communication: System remains "switched on" until line communication is restored. All train passing messages are communicated this way. Permission to approach each train.
  • Communication Procedures: Identification Number required for each train message. Simplex system, one station speaks at a time. All messages end with "OVER," and the preset switch is immediately released.
  • Frequencies: 160.550 MHz (Channel 5), 159.600 MHz (Channel 6), 151.400 MHz (Channel 7) frequencies use for communications.
  • Line Clear Procedure: 3 Frequencies (5, 6, & 7) used for line clear on 25W simplex VHF sets. Channel 5 priority in TFC.
  • Identification Numbers: Used to identify train passing message. Sr. DOM / Sr. DOM(G) / DOM(G) issues sheets with combinations of letters to identify each station.

Identification Number Sheets

  • Sheet Functionality: Two sheets per block section, each sheet contains two columns of letters and figures.
  • Sheet Use: Left half of the sheet goes to one end of the section; right half to the other. Sr. DOM / Sr. DOM(G)/ DOM(G) writes station names on the sheet, signs and dates it, places in sealed envelope and gives to the station. A separate sheet used for each time a communication system is interrupted, and each station gets two sheets.
  • Interruption End: Once communication is restored sheet returned to Sr. DSO/Divisional Safety Officer for replacement.
  • Multiple Interruptions: Five sheets are issued if multiple interruptions expected.
  • Numbering: Covers for sheets numbered, and a separate entry is made on the Line-Clear Ticket/Train Signal Register for the successful use of the identification sheet.
  • Safety: Stations must keep Identification sheets under lock and key.

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Test your understanding of VHF set rules during Total Communication Failure (TFC). This quiz covers protocols for initiating and maintaining communication, including the necessary frequencies and procedures to follow. Ensure you are well-versed in these essential communication strategies.

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