Absolute Block System Essentials Quiz
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Absolute Block System Essentials Quiz

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Questions and Answers

What must happen before a train can leave a block station under the Absolute Block System?

  • The previous train must have left the area.
  • Line Clear must be received from the block station in advance. (correct)
  • The Station Master must signal the train.
  • All signals must be reset to 'off'.

    • What is the minimum adequate distance required for Line Clear on two-aspect signalling?

  • 400 metres (correct)
  • 600 metres
  • 180 metres
  • 200 metres

    • Which condition is NOT necessary for granting Line Clear at a class A station?

  • The last preceding train must have arrived complete.
  • All signals must be placed back to 'on' behind the preceding train.
  • The line must be clear up to the Starter.
  • All points must be incorrectly set for the incoming train. (correct)

    • What must be ensured for granting Line Clear on single lines?

    <p>The line must be clear of trains running in both directions.</p> Signup and view all the answers

    What is the requirement for granting Line Clear regarding signals?

    <p>All signals must be set to 'on' behind the last train.</p> Signup and view all the answers

    Under what condition can Line Clear not be granted on a double line?

    <p>If the line is not clear up to the Stop signal and beyond.</p> Signup and view all the answers

    What does ‘adequate distance’ refer to in Line Clear conditions?

    <p>A predetermined distance to ensure safety.</p> Signup and view all the answers

    Which of the following is NOT a consideration for Line Clear on single lines?

    <p>The condition of the last completed train is irrelevant.</p> Signup and view all the answers

    What must occur before the line outside the first Stop signal can be obstructed at a class 'B' station?

    <p>The line must have been blocked back</p> Signup and view all the answers

    Which method is NOT an authority for shunting in a block section?

    <p>A verbal command from the station master</p> Signup and view all the answers

    Which signals are present at a class 'B' Single line station in two-aspect signalling territory?

    <p>Outer and Home signals</p> Signup and view all the answers

    What does not describe the procedure for block back or block forward?

    <p>It can be done at any time</p> Signup and view all the answers

    Which signal is included in a class 'B' Double line station in Modified Lower-quadrant signalling territory?

    <p>Advanced Starter signal</p> Signup and view all the answers

    What must not be permitted when signals are taken off for an incoming train on a non-isolated line?

    <p>Shunting movement towards the points</p> Signup and view all the answers

    What obstruction is allowed once Line Clear has been given in the block section in rear?

    <p>No obstruction is permitted</p> Signup and view all the answers

    Under what conditions may shunting or obstruction be permitted in a block section in advance?

    <p>When the section is clear and blocked backward</p> Signup and view all the answers

    What is required for shunting to be performed in the block section at a class 'A' station?

    <p>Line Clear from the other end station master</p> Signup and view all the answers

    When may shunting be conducted with regards to a train travelling away from the station?

    <p>Under special instructions considering operational factors</p> Signup and view all the answers

    What must be ensured about obstructions in the block section in rear once Line Clear has been given?

    <p>They must be completely removed</p> Signup and view all the answers

    What action should be taken as soon as intimation is received that an incoming train has arrived at the block station in advance?

    <p>Block the line forward if still obstructed</p> Signup and view all the answers

    What is not permitted outside the Home signal at a class 'A' station when a train is approaching?

    <p>Any kind of obstruction</p> Signup and view all the answers

    What happens if the block section is blocked back at a class 'A' station?

    <p>Shunting or obstruction is permitted</p> Signup and view all the answers

    When should obstructions not be permitted on double lines in a block section?

    <p>When Line Clear has been given</p> Signup and view all the answers

    What must occur before blocking a section when a train has arrived?

    <p>Distinct orders from the Station Master must be received.</p> Signup and view all the answers

    What is required for granting Line Clear at a class ‘C’ station?

    <p>The last preceding train must be complete at least 400 meters beyond the Home signal.</p> Signup and view all the answers

    Under what conditions can obstruction in the face of an approaching train at a class 'B' station be permitted?

    <p>When a Shunting Limit Board or an Advanced Starter is provided.</p> Signup and view all the answers

    At a class ‘B’ station, what is permitted when Line Clear has been given?

    <p>Shunting within the station section continuously.</p> Signup and view all the answers

    What should be included in the SWR when shunting is permitted?

    <p>All restrictions required for shunting.</p> Signup and view all the answers

    What condition must be fulfilled for granting Line Clear at a class ‘B’ single line station?

    <p>Distance must meet conditions prescribed in Rules 8.01 and 3.40.</p> Signup and view all the answers

    What does Rule 8.09 state about shunting when signals are kept at ‘on’?

    <p>Shunting may occur within the station section under certain provisions.</p> Signup and view all the answers

    What must be considered before allowing obstruction in the face of an approaching train?

    <p>The weight and brake power of trains.</p> Signup and view all the answers

    What must the Station Master do before granting Line Clear for a train at a class ‘B’ station?

    <p>Comply with provisions of S.R.3.49.2 &amp; 3.</p> Signup and view all the answers

    What is the implication of taking signals ‘off’ for an incoming train?

    <p>No shunting movement shall be carried towards the points over which the incoming train will pass.</p> Signup and view all the answers

    For a class ‘C’ single line station, what additional requirement is included for Line Clear?

    <p>The line must be clear from blocking trains running opposite.</p> Signup and view all the answers

    Which of the following best describes the use of obstructions at a block station with a train approaching at a class ‘A’ station?

    <p>No obstruction is permitted outside the Home signal.</p> Signup and view all the answers

    What safety measure is required to warn Loco Pilots of approaching trains during shunting?

    <p>A board in rear of the Outer signal or Home signal.</p> Signup and view all the answers

    What is implied about the condition of the line during shunting at class 'B' stations?

    <p>The necessary signals can still be at ‘on’.</p> Signup and view all the answers

    What must happen to signals taken 'off' for the preceding train at a class ‘C’ station?

    <p>They must be put back to 'on' after the train passes.</p> Signup and view all the answers

    What does the term 'Line Clear' signify at a class ‘B’ station?

    <p>A train can be signaled to proceed.</p> Signup and view all the answers

    What specific factor must be indicated in the SWR when obstruction is permitted?

    <p>The specific shunting procedures to be followed.</p> Signup and view all the answers

    What aspect of the approaching train is the Loco Pilot required to be aware of?

    <p>The speed, weight, and brake power.</p> Signup and view all the answers

    How does the rule regarding obstruction at a class ‘B’ station differ from that at a class ‘A’ station?

    <p>Class ‘A’ stations permit no obstruction outside the Home signal.</p> Signup and view all the answers

    What must be true for a station before granting Line Clear for a train?

    <p>All preceding trains must have cleared the area.</p> Signup and view all the answers

    What authority must be provided for shunting in a block section at a class 'B' station?

    <p>A shunting arm or token of prescribed design</p> Signup and view all the answers

    Under what condition can the line outside the first Stop signal at a class 'B' station be obstructed?

    <p>Only when the line has been blocked back</p> Signup and view all the answers

    Which of the following is NOT included in the signalling territory for a class 'B' single line station?

    <p>Advanced Starter signal</p> Signup and view all the answers

    What must be followed for the procedures of block back or block forward?

    <p>Prescribed procedures as outlined in special instructions</p> Signup and view all the answers

    Which statement accurately describes the signals present at a class 'B' double line station in two-aspect signalling territory?

    <p>It includes Distant, Home, and Starter signals</p> Signup and view all the answers

    Which statement is true regarding the conditions to grant Line Clear at a class 'A' station?

    <p>The last train's entire composition must arrive before granting Line Clear.</p> Signup and view all the answers

    What is the minimum distance for granting Line Clear on single lines according to the Absolute Block System?

    <p>180 metres</p> Signup and view all the answers

    When is it acceptable to give Line Clear on double lines according to the Absolute Block System?

    <p>Only after ensuring it is clear for an adequate distance beyond the first Stop signal.</p> Signup and view all the answers

    Which of the following is NOT a factor in ensuring Line Clear at a class 'A' station?

    <p>The incoming train must exceed the stopping distance.</p> Signup and view all the answers

    What determines the adequate distance when granting Line Clear for two-aspect lower quadrant signalling?

    <p>400 metres</p> Signup and view all the answers

    Which requirement must be satisfied for granting Line Clear on single lines?

    <p>The line must be clear of trains in both directions up to the first Stop signal.</p> Signup and view all the answers

    What action must the Station Master take before granting Line Clear for a train?

    <p>Check that previous trains are cleared and signals are all 'on'.</p> Signup and view all the answers

    What should the adequate distance not be less than for multiple-aspect signalling?

    <p>180 metres</p> Signup and view all the answers

    What must occur before obstructing the line outside the station section at a class 'B' single line station equipped with two-aspect signals?

    <p>A railway servant must be appointed and the block section must be clear.</p> Signup and view all the answers

    Under what condition can the line outside the station section not be obstructed during thick, foggy, or tempestuous weather?

    <p>Unless authorized by special instructions.</p> Signup and view all the answers

    What is required when a shunt signal is not provided on the LSS?

    <p>The Loco Pilot receives written authority using form T/806.</p> Signup and view all the answers

    What safety indication must be provided on the rear most vehicle during shunting operations?

    <p>A tail lamp or tail board on the side facing the station.</p> Signup and view all the answers

    In manual multiple-aspect signal systems at a class 'B' station, when can obstruction occur?

    <p>If the railway servant on duty has confirmed clear for shunting.</p> Signup and view all the answers

    Which condition must NOT be considered before obstructing the line at a class 'B' station during a fog?

    <p>Visibility of at least 100 meters.</p> Signup and view all the answers

    What specific instruction is given when obstruction is required in adverse weather conditions?

    <p>Shunting operations cannot proceed without authorization.</p> Signup and view all the answers

    In nighttime operations at a class 'B' single line station, what is specifically prohibited?

    <p>Obstruction under Clause (b) of Rule 8.11.</p> Signup and view all the answers

    What is a necessary measure when conducting shunting at a class 'B' station during adverse weather?

    <p>Train operators must ensure total clearance of the block.</p> Signup and view all the answers

    What must be provided at class 'B' stations for obstruction in the face of an approaching train to be permitted?

    <p>Both A and B</p> Signup and view all the answers

    Which factors are considered before permitting obstruction in the face of an approaching train?

    <p>Speed, weight, and brake power of trains</p> Signup and view all the answers

    What is required by the SWR when obstruction in the face of an approaching train is allowed?

    <p>Signage must be installed to warn Loco Pilots</p> Signup and view all the answers

    What precautions must be followed during shunting operations as indicated in Rule 5.20?

    <p>Strictly adhere to speed limits</p> Signup and view all the answers

    What condition must be satisfied for shunting to occur when signals are kept at 'on'?

    <p>Provisions of Rule 8.09 must be fulfilled</p> Signup and view all the answers

    When signals are taken 'off' for an incoming train on a non-isolated line, what is strictly prohibited?

    <p>Shunting operations over which the incoming train will pass</p> Signup and view all the answers

    Which statement is true regarding the provision of obstruction signals at class 'B' stations?

    <p>Shall be specifically indicated in the SWR</p> Signup and view all the answers

    What is the role of the Station Master before shunting operations can commence at a class 'B' station?

    <p>To give distinct orders for shunting operations</p> Signup and view all the answers

    Under what circumstances can obstruction within a station section at a class 'B' station be conducted?

    <p>If the necessary signals are kept at ‘on’</p> Signup and view all the answers

    What must be considered when blocking the line outside the first Stop signal at a class 'B' station?

    <p>Visibility of light signals from a distance</p> Signup and view all the answers

    What is necessary for Line Clear to be granted at a class ‘B’ station equipped with two-aspect signalling?

    <p>The line must be clear up to the Home signal.</p> Signup and view all the answers

    At a class ‘B’ single line station, what must be the state of the line for Line Clear to be considered?

    <p>Clear up to the nearest Shunting Limit Board or Advanced Starter.</p> Signup and view all the answers

    What is the condition involving signals when granting Line Clear at a class ‘B’ station?

    <p>All necessary signals must be returned to 'on' behind the last preceding train.</p> Signup and view all the answers

    Which of the following statements is true regarding the requirements for Line Clear at a class ‘B’ station on a double line?

    <p>The entire last train must arrive complete for Line Clear.</p> Signup and view all the answers

    In the context of granting Line Clear at station equipped with modified lower quadrant signalling, what is a specific requirement?

    <p>The line must be clear at the outermost facing points.</p> Signup and view all the answers

    When considering the conditions for granting Line Clear at a class 'B' single line station, what is an important signal-related requirement?

    <p>All necessary signals behind the last train must be set back to 'on'.</p> Signup and view all the answers

    Which specific location determines the requirement for the line to be clear at a class 'B' station equipped with two-aspect signalling?

    <p>Upto the Home signal.</p> Signup and view all the answers

    What is the clear requirement for granting Line Clear concerning the last train at a class 'B' station?

    <p>The whole preceding train must have arrived complete.</p> Signup and view all the answers

    In the context of granting Line Clear, what is the significance of the Shunting Limit Board at a class 'B' single line station?

    <p>It determines where the line must be clear up to for granting Line Clear.</p> Signup and view all the answers

    For a class ‘B’ station equipped with multiple-aspect signalling, which condition must be met to grant Line Clear?

    <p>The line must be clear at the outermost facing points.</p> Signup and view all the answers

    Study Notes

    Absolute Block System Essentials

    • No train shall leave a block station without receiving Line Clear from the preceding block station.
    • On double lines, Line Clear is not given unless the line is clear up to the first Stop signal and for an adequate distance beyond it.
    • On single lines, Line Clear is not given unless the line is clear for an adequate distance beyond the first Stop signal, free of trains running in the same direction, and clear of trains running in the opposite direction towards the block station.
    • The adequate distance referred to in the above points should be at least 400 meters for two-aspect signalling and 180 meters for multiple-aspect or modified lower quadrant signalling.

    Conditions for Granting Line Clear

    • Class 'A' Stations: The line is considered clear and Line Clear can be given only when:
      • The whole of the last preceding train has arrived completely.
      • All signals have been put back to ‘on’ behind the said train.
      • The line on which the incoming train is to be received is clear up to the Starter.
      • All points have been correctly set, and all facing points have been locked for the admission of the train.
    • Class 'B' Stations on Single Line:
      • This rule does not forbid direct reception of a train from one side if Line Clear has been given to the block station on the other side, provided the distance between the signals and points meets specific requirements.
    • Class 'C' Stations: Line Clear cannot be given unless:
      • The last preceding train has passed at least 400 meters beyond the Home signal and is continuing its journey.
      • All signals taken ‘off’ for the preceding train have been put back to ‘on’ behind the said train.
      • On single line, the line is clear of trains running in the opposite direction towards the block hut.

    Obstruction on Double Lines

    • When Line Clear has been given:
      • Class 'A' Station: No obstruction is permitted outside the Home signal, or up to the Starter on the line the train is to be admitted to.
      • Class 'B' Station: No obstruction is permitted outside the station section, but shunting within the station section can continue, provided the necessary signals are kept at ‘on’.
    • No shunting is permitted towards the points over which the incoming train will pass when signals have been taken ‘off’ for it.
    • Block Section:
      • No obstruction is permitted in the block section in rear when Line Clear has been given.
      • Shunting or obstruction in the block section in rear is permitted only if it is clear and blocked back.
      • Shunting or obstruction in the block section in advance is permitted only if it is clear and blocked forward.
      • Behind a train occupying the block section in advance, shunting or obstruction may be permitted under special instructions only.

    Obstruction on Single Lines

    • Class 'A' Stations:
      • When Line Clear has been given, no obstruction shall be permitted outside the Home signal, or on the line where the train is to be admitted, up to the Starter.
      • The block section cannot be obstructed for shunting purposes unless:
        • The Station Master has received Line Clear from the other end of the block section.
        • The block section blocked back.
        • The block section is occupied by a train travelling away from the Station.
        • The Loco Pilot has received distinct orders from the Station Master to shunt.
    • Class 'B' Stations:
      • The line outside the Home signal can only be obstructed when a Shunting Limit Board or Advanced Starter is provided.
      • Shunting within the station section is allowed if the necessary signals are at ‘on’ and the provisions for shunting up to the Shunting Limit Board or Advanced Starter are met.
      • No shunting movement can be performed towards the points on the line which is not isolated when signals have been taken ‘off’ for an incoming train.
      • The line outside the first Stop signal cannot be obstructed unless the line is blocked back.

    General Provisions

    • Block back or Block forward: This action should be carried out according to the procedure outlined in special instructions.
    • Authority for Shunting or Obstruction in Block Section: The Loco Pilot must receive specific authority for shunting in the block section, as prescribed in special instructions, which may be a:
      • Shunting arm.
      • Token.
      • Written permission.

    The Absolute Block System

    • The Absolute Block System is used to control train movements on a railway line.
    • This system requires trains to receive a Line Clear signal from the block station before they can leave a block station.
    • This signal ensures the track ahead is clear for the designated distance.
    • The required clear distance varies based on the type of signaling used, being 400 meters for two-aspect signaling and 180 meters for multiple-aspect or modified lower quadrant signaling.

    Conditions for Granting Line Clear

    • At Class A stations, the line is considered clear only when the preceding train has arrived, signals behind the train are restored to “on,” the line is clear to the Starter signal, and all points are set correctly with facing points locked.
    • Class B stations on double lines are considered clear when the preceding train is complete, necessary signals are restored to “on,” and the line is clear up to the Home signal (two-aspect) or the outermost facing points or Block Section Limit Board (multiple-aspect or modified lower quadrant).
    • Class B stations on single lines are considered clear when the preceding train is complete, necessary signals are restored to “on,” the line is clear up to the Shunting Limit Board or Advanced Starter (two-aspect), or up to the Home signal, outermost facing points, or Shunting Limit Board or Advanced Starter (multiple-aspect or modified lower quadrant).

    Obstruction in Block Sections

    • Obstruction in the face of an approaching train at a Class B single line station is only permitted when a Shunting Limit Board or Advanced Starter is present and under special instructions that consider train speed, weight, brake power, gradients, signal visibility, and distance.
    • At stations where obstruction is permitted, a warning board is provided to inform Loco Pilots. Shunting operations must adhere to the precautions outlined in Rule 5.20.
    • Obstruction within the station section at a Class B single line station is only permissible if necessary signals are “on” and the provisions for obstruction up to the Shunting Limit Board or Advanced Starter are met.
    • Shunting is not allowed towards points over which an incoming train is approaching.
    • Obstruction outside the station section at a Class B single line station equipped with two-aspect signals requires a designated railway servant to be in charge and ensures that either the block section is clear or, if the approaching train is at the Outer signal, the Station Master personally confirms the train is at a standstill.
    • This is not permitted at night or in thick fog or tempestuous weather.
    • Obstruction outside the station section at a Class B single line station equipped with manually operated multiple-aspect signals mandates a designated railway servant and a clear block section.
    • Obstruction outside the first Stop signal at a Class B station on single line requires the line to be blocked back.

    General Provisions

    • Block back or block forward procedures must follow the special instructions defined in the Block Working Manual.
    • When shunting or obstruction is allowed in the block section, the Loco Pilot is given authority through a shunting arm, token, or written permission.
    • Diagrams illustrating Class A, B, and C stations with various signaling configurations are provided.

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    Ch 8 GR PDF

    Description

    Test your knowledge of the Absolute Block System essentials. This quiz covers critical concepts about Line Clear protocols, specific conditions for granting Line Clear at Class 'A' stations, and the necessary distances for different signaling systems. Perfect for railway professionals and enthusiasts alike!

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