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?

The identity of the Station Master and Private Numbers Signup and view all the answers

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

One minute Signup and view all the answers

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

Release the Pressel Switch Signup and view all the answers

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

An Identification Number for each train Signup and view all the answers

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

Channel 5 Signup and view all the answers

What frequency is associated with Channel 6?

159.600 MHZ Signup and view all the answers

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

By the numbering system applied Signup and view all the answers

What is the frequency for Channel 7?

151.400 MHZ Signup and view all the answers

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

Channel 2 Signup and view all the answers

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

To sign and date the sheets Signup and view all the answers

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

3 frequencies Signup and view all the answers

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

Channel 6 Signup and view all the answers

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

Station names with identifiers Signup and view all the answers

What is the purpose of issuing Identification Number sheets?

To track communication interruptions Signup and view all the answers

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

Two Signup and view all the answers

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

It must be sent back immediately Signup and view all the answers

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

The section and relevant cover number Signup and view all the answers

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

Five Signup and view all the answers

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

Two Identification Number sheets Signup and view all the answers

What is the process for separating the Identification Number sheets?

Each sheet is torn in half Signup and view all the answers

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

To the station master Signup and view all the answers

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

Kalyani and Madanpur Signup and view all the answers

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

The sequence of handling is maintained Signup and view all the answers

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

It must be recorded in the Train Signal Register and the Line Clear Ticket. Signup and view all the answers

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

It should be returned immediately to the Sr.DOM. Signup and view all the answers

How should an Identification Number sheet be secured once opened?

It must be kept under lock and key. Signup and view all the answers

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

To send out fresh Identification Number sheets without delay. Signup and view all the answers

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

It must be returned to the Sr.DOM after the interruption. Signup and view all the answers

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

Call Kalyani on the telephone to open sealed envelope no. 1. Signup and view all the answers

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

Verify the identification number and signal that he is ready to receive. Signup and view all the answers

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

Kalyani must provide his private numbers to Madanpur. Signup and view all the answers

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

Record the number and date against the identification number. Signup and view all the answers

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

Provide permission to approach and mention the corresponding identification number. Signup and view all the answers

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

They ensure proper sequential identification for subsequent trains. Signup and view all the answers

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

During total interruption of communications. Signup and view all the answers

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

Communicate immediately that he is ready to receive. Signup and view all the answers

What should happen during the inquiry message sent by Madanpur?

It must end with the identification letter and figure. Signup and view all the answers

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

Reading out his own identification letter and figure. Signup and view all the answers

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

To signal the end of a message. 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?

To ensure correct communication between stations. Signup and view all the answers

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

Only one Station Master can speak at a time. Signup and view all the answers

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

Identity of the Station Master and train number. Signup and view all the answers

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

They remain switched on until line communication is restored. Signup and view all the answers

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

OVER Signup and view all the answers

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

Immediately switch on the wireless sets at both ends. Signup and view all the answers

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

It should be returned to the Sr.DOM for checking. Signup and view all the answers

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

Keep them in his possession or under lock and key. Signup and view all the answers

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

Destroy them after ensuring they match with their corresponding halves. Signup and view all the answers

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

Keep the envelope unopened until absolutely necessary. Signup and view all the answers

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

Return it along with any partly used sheets to the Sr.DOM. Signup and view all the answers

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

Revert back to channel 2 after TFC. Signup and view all the answers

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

Channel 5, Channel 6, Channel 7, Channel 5, Channel 6 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?

Write the names of the two stations over the columns. Signup and view all the answers

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

Both sections contain the same letters and figures but in different orders. Signup and view all the answers

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

They are designated for specific sections with identifiable frequency ranges. 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?

Sign and date the halves before distribution. Signup and view all the answers

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

160.550 MHZ Signup and view all the answers

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

They match the data entries between both halves. Signup and view all the answers

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

159.600 MHZ Signup and view all the answers

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

Two sheets Signup and view all the answers

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

Return it immediately to the Sr.DSO Signup and view all the answers

How are the envelopes containing the Identification Number sheets marked?

With a number and the section name Signup and view all the answers

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

To validate authenticity and record the issuance 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?

Five sheets Signup and view all the answers

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

Each half is placed in a sealed envelope Signup and view all the answers

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

The current date Signup and view all the answers

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

As a standardized protocol Signup and view all the answers

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

To track the movement of sheets between stations Signup and view all the answers

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

They are separated and secured in envelopes Signup and view all the answers

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

Wait for Kalyani to confirm readiness without providing his own identification Signup and view all the answers

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

Check it against his list for accuracy Signup and view all the answers

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

Madanpur will send the Line Clear message Signup and view all the answers

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

Kalyani's identification number along with Private Numbers Signup and view all the answers

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

Take note of the private numbers used Signup and view all the answers

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

Enter the number and date of the train against each identification number immediately Signup and view all the answers

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

Kalyani must verify the section is clear Signup and view all the answers

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

Obtain a new identification number each time in a serial manner Signup and view all the answers

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

To ensure the authenticity of the communication Signup and view all the answers

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.