Block Instruments Safety Standards

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Questions and Answers

What key information is present in both Portion A and Portion B?

Serial Number of Station Master

Total Number of Tokens Taken (correct)

Station location

Date & Time (correct)

Which of the following is NOT included in either Portion A or Portion B?

Name of Station

Tokens Taken

Type of Tokens (correct)

Signature of Station Master

What does the 'Signature of' section indicate in both portions?

Record of the number of tokens

Validation of the tokens' authenticity

Confirmation of receipt (correct)

Notation of the time taken

What is required to validate the transactions in both portions?

Station Master’s Signature Signup and view all the answers

Which piece of information would you expect to find in the 'Total No.' section?

The cumulative count of tokens taken Signup and view all the answers

What is the purpose of Intermediate Block Signalling (IBS)?

To increase section capacity by splitting long block sections Signup and view all the answers

Which parameter determines the start of the rear section in Intermediate Block Signalling?

The LSS of the rear station Signup and view all the answers

How is train entry into the advance section controlled?

By the IBS in that direction Signup and view all the answers

What should be ensured regarding the signal levels at electronic equipment?

They must not exceed permissible limits Signup and view all the answers

What is used to monitor track sections in both the rear and advance sections?

Axle Counter or Track circuit Signup and view all the answers

What is one of the provisions at the IBS post for effective communication?

Signal Post Telephone (SPT) Signup and view all the answers

What maintenance schedule should be followed for Embedded type Block working?

The OEM maintenance manual for Electronic Interlocking and VDU Signup and view all the answers

What factor may require staggering up and down IBS?

Presence of steeper gradients on approach Signup and view all the answers

What is necessary for Block Instruments to function correctly regarding their mounting?

They must be mounted level. Signup and view all the answers

What should be checked to ensure the correct connection of polarities in Block Instruments?

Correct polarities must be connected to the instruments at both ends. Signup and view all the answers

Which check is essential for ensuring the mechanical integrity of Block Instruments?

Ensuring that all mechanical parts are free to move without undue friction. Signup and view all the answers

What is a critical requirement for the insulation of electrical components in Block Instruments?

Insulation should be checked for leakage from the body to earth. Signup and view all the answers

What is the minimum acceptable insulation resistance between individual insulated circuits and Earth for Block Instruments?

10 mega ohms. Signup and view all the answers

Which condition must be met before the Last Stop Signal at the sending station can be taken 'OFF'?

The receiving station instrument must be set to 'Train Coming From' condition. Signup and view all the answers

Which statement regarding checks made before the installation of Block Instruments is correct?

The Front Panel should be free from splitting, twisting, or warping. Signup and view all the answers

During the testing of Single Line Tokenless Block Instruments, which procedure is critical?

Block release should occur by operating two track circuits sequentially. Signup and view all the answers

What color should the body of a Single Line Tokenless Block Instrument be painted?

Grey Enamel Signup and view all the answers

Which maintenance schedule pertains to Analog Block Axle Counter Systems?

18-MS4 Signup and view all the answers

What type of painting scheme is used for the woodwork of Double Line Block Instruments?

Spirit Polish Signup and view all the answers

Which option describes the painting specification for the Operating Handle of Single Line Ball Token Block Instruments?

White Signup and view all the answers

What is the maintenance schedule number for the Double Line Lock & Block Instrument?

18-MS2 Signup and view all the answers

Which drawing number corresponds to the IB Hut Layout Plan?

18-D1 Signup and view all the answers

What color is designated for the metal casing of Double Line Block Instruments?

Green Enamel Signup and view all the answers

For Single Line Tokenless Block Instruments using the Push Button type, what color is the base painted?

Black Enamel Signup and view all the answers

What action should be taken if a lost token is not found after six months?

It shall be replaced with a token of the next higher number. Signup and view all the answers

Which document must be endorsed by the Senior Section Engineer before issue?

Token Balance Book Signup and view all the answers

What is the purpose of the Token Balance Book?

To track the balance of tokens transferred between instruments. Signup and view all the answers

What is the primary purpose of the supervisory track section (DN-SPT)?

To cover multiple track sections for second level reset Signup and view all the answers

Which track section starts from the foot of LSS and ends at 400 meters ahead of the IB home signal?

AS track section Signup and view all the answers

When should extracting or replenishment of tokens in token instruments be done?

Only when the instruments are in the 'Line Closed' position. Signup and view all the answers

What must be done when the balance of tokens falls to 'Six'?

The Technician must advise the Station Master. Signup and view all the answers

What issue can arise when a loaded rake moves over the coil portion?

The wheel may jump over the coil causing a miscount Signup and view all the answers

What does the BPAC section prove?

Block overlap between stations Signup and view all the answers

What is the responsibility of the staff operating the instruments?

To follow the correct use of the code of bell signals. Signup and view all the answers

What condition may cause the single detection system to enter a 'hang' state?

Long haul movement or to and fro wheel movement over the coil Signup and view all the answers

Why are damaged token pouches not allowed to be used?

They present a safety hazard. Signup and view all the answers

What is the maximum distance the IB track section extends ahead of the IB home signal?

400 meters Signup and view all the answers

Which of the following is NOT a responsibility of the Technicians?

Bearing the cost of ticket audits. Signup and view all the answers

Why is dual detection necessary for rail systems?

Single detection is prone to failures despite precautions Signup and view all the answers

Which of the following tracks is defined as the AS track section?

DN-AC Signup and view all the answers

What is the maximum voltage that the immunity of a PR relay supports?

10 V Signup and view all the answers

What is the minimum resistance allowed for the separate earth provided for each instrument?

10 ohms Signup and view all the answers

Which of the following configurations is NOT mentioned for the tokens provided in consecutive block sections?

Configuration D Signup and view all the answers

What is the requirement for the length of the earth wire connected to an electrical instrument?

Short as possible Signup and view all the answers

What is the acceptable diameter of the earth wire used for grounding instruments?

4 mm Signup and view all the answers

What must be ensured regarding the installation of token instruments?

Tokens from one section cannot be placed in any other instrument. Signup and view all the answers

Where should the separate earth for electrical instruments be installed?

At a depth of at least 1.5 meters from the surface Signup and view all the answers

What should be avoided regarding the shape of the earth wire?

It must not have a sharp bend. Signup and view all the answers

What is a significant reliability issue with conventional Intermediate Block signaling?

Lack of signal redundancy with SSDACs Signup and view all the answers

Which detection device is used for track vacancy detection in the typical schemes of Intermediate Block signaling?

Analog axle counters Signup and view all the answers

Which signaling scheme employs copper cable in the Indian Railways for Intermediate Block signaling?

Conventional IB Signup and view all the answers

In what way do Multi Section Digital Axle Counters (MSDACs) enhance the signaling system?

By facilitating the exchange of signaling information Signup and view all the answers

What primary factor affects the availability of conventional IB signaling systems?

Single detection without duplication Signup and view all the answers

Which of the following is NOT a typical IB signaling scheme currently in use?

IB with digital fiber optics Signup and view all the answers

What role do analog axle counters serve in Intermediate Block signaling?

Monitoring track vacancy status Signup and view all the answers

What operational challenge is posed by the single detection system in Intermediate Block signaling?

Potential to lead the system into a non-responsive state Signup and view all the answers

What is the specified color for the metal casing of Double Line Block Instruments?

Green Enamel Signup and view all the answers

Which maintenance schedule corresponds to Tokenless Block Instrument with Handle Type?

18-MS5 Signup and view all the answers

What color is designated for the Operating Handle of Single Line Ball Token Block Instruments?

Black Enamel Signup and view all the answers

Which drawing number is associated with the IB Hut Layout Plan?

18-D1 Signup and view all the answers

What color should the body of a Single Line Tokenless Block Instrument (Push Button Type) be painted?

Grey Signup and view all the answers

Which maintenance schedule pertains to the Universal Fail-Safe Block Interface?

18-MS6 Signup and view all the answers

What is the painting specification for the woodwork of Double Line Block Instruments?

Spirit Polish Signup and view all the answers

Which of the following drawing numbers corresponds to protective devices for AC Electrified Area of Neale’s ‘A’ Type Token Instrument (Earth Return)?

18-D5 Signup and view all the answers

What is the purpose of ensuring the locking Pawl is correctly shaped and has a width of 9.5 mm?

To ensure effective locking functionality Signup and view all the answers

Which maintenance procedure is specifically required for Double Line Block Instruments during overhauling?

The locking assembly must be replaced irrespective of its condition Signup and view all the answers

What should be verified regarding the tablet holding arm release lever in a Tablet instrument?

It should only release tablets after full rotation and handle release Signup and view all the answers

What is the requirement for the locks of the rocker arm associated with 'Train going to' and 'Train Coming From'?

They must be positioned about 1 mm above the rack Signup and view all the answers

In the context of UFSBI Block Panel, what must be maintained within permissible values?

Various parameters of Axle Counter track equipment Signup and view all the answers

What is a critical maintenance step for single line tokenless instruments during routine checks?

Carrying out tests as enumerated in the provided guidelines Signup and view all the answers

What are the notches in the rack required to be checked for?

They should be correctly shaped and square Signup and view all the answers

What is a recommended action when maintenance inspections reveal significant wear and tear?

Replace parts immediately to ensure safety Signup and view all the answers

What is the main function of the IO-EXBs in the signaling system?

To exchange vital relay status and indications between locations Signup and view all the answers

In quad mode, how many vital I/Os are exchanged between two IO-EXBs?

3 I/Os Signup and view all the answers

What distinguishes the non-vital mode from the vital mode in IO-EXB operation?

Non-vital mode can exchange 12 I/Os as opposed to 3 Signup and view all the answers

Which of the following is included in the information required to be exchanged between two locations?

Relay status and signals Signup and view all the answers

When using the single mode for IO-EXB operation, how are the inputs categorized?

Inputs are designated as spare and functional Signup and view all the answers

What is the significance of the 'spare' designation in IO-EXB input functions?

Indicates inputs that can remain inactive during operation Signup and view all the answers

Which of the following functions does NOT belong to the output functions in quad mode for IO-EXBs?

OUTPUT 4A Signup and view all the answers

Which setup is indicated by INPUT 1A in the context of IO-EXB functions?

Spare function input Signup and view all the answers

How does quad mode compare to single mode in terms of information exchange capacity?

Quad mode allows for a greater number of vital I/Os exchanged Signup and view all the answers

What critical role does the 'OUTPUT' designation play in the IO-EXB configuration?

It reflects the actions taken in response to inputs received Signup and view all the answers

What must be accomplished before setting instruments to 'Train Going To' or 'Train Coming From'?

Both instruments must be restored to normal. Signup and view all the answers

What happens when a token is extracted while the instrument is set to 'Train Going To'?

Only one token can be extracted. Signup and view all the answers

Which statement correctly describes the operation of the 'Line Clear' mechanism?

It must not enable both 'Line Clear' actions at the same time. Signup and view all the answers

What feature is required for the installation of token instruments to prevent misuse?

A token from one block section cannot be placed in an adjacent instrument. Signup and view all the answers

What is the purpose of having fixed indications in Single Line Tokenless Block Instruments?

To indicate if a train has entered the block section. Signup and view all the answers

What system is used to ensure immunity from extraneous currents in Single Line Tokenless Block Instruments?

Frequency modulated current systems. Signup and view all the answers

What must be engraved on the Tokens of each section?

The code name of stations and a serial number. Signup and view all the answers

What is the first instrument to be restored to 'Line Closed' after a train has completely arrived?

The instrument set to 'Train Going To'. Signup and view all the answers

Study Notes

Block Instruments, BPAC & IBS Working

General Requirements:
- Block instruments must be robust and approved type.
- Suitable protective measures are required on sections with AC voltage induction.
- Instruments are primarily used with physical conductors, but Radio/Optical Fibre Cable can be used if needed.
- A lightning discharger must be included on all instruments.
- No openings allowing for unauthorized operation.
- Locking and sealing mechanisms must be present.
- The Station Master on duty must have a key to prevent unauthorized operation.
- An isolated power supply (battery or DC-DC converter) is required for the line circuit of each block instrument.
- Tokenless Block Instruments are worked on metallic return circuits.
Special Requirements of Single Line Token Block Instruments:
- Fixed indicators showing normal conditions ("Line Closed"), train arrival ("Train Coming From"), and departure ("Train Going To").
- Current indicator showing current polarity.
- Operation requires cooperation from the other station master.
- "Line Closed" is the state that must be restored before further operations are possible.
- "Line Clear" operation cannot be performed simultaneously by both instruments
Special Requirements of Single Line Tokenless Block Instruments:
- Fixed indicators showing train presence ("Train on Line") or absence.
- Immunity to extraneous currents is ensured by use of a special system.
- Operation ("Train Going To" and "Train Coming From") needs the other station master's specific co-operation.
- Instruments are set to "Line Closed" before other operations.
Special Requirements of Double Line Block Instruments:
- Visual indicators for up and down lines ("Line closed", "Line clear", "Train on Line").
- Current indicators aligned with those of the above.
- Operation requires a series of specific steps, preventing simultaneous operations.
- Audible indicators warn when a train passes specific points (Home Signal, Last Stop Signal).
Non-Co-operative type Instruments:
- Automatic "Train On Line" is automated.
- Audible indicators to warn the receiving station.
- Shunting keys interlocked with block instruments.
- Track circuits and Axle Counters for block section verification.
Section 2: Special Requirements of Block Working in RE Area:
- Only specific types of block instruments are allowed in electrified 25 KV lines.
Section 3: Installation of Block Instruments:
- All instruments are fixed stably.
- Turn-tables allow easy maintenance.
- Distinctive tones are used on instruments used in the same room.
Section 4: Installation of Single Line Token Instruments:
- Installation must prevent token placement in the incorrect instrument.
- Consecutive block sections are assigned different token configurations (A, B, C, D, & E)
- Tokens must be mounted in level.
Section 5: Installation of Single Line Tokenless Block Instrument:
- Level mounting is required
- Insulation resistance must be measured between each circuit and Earth.
- Block release occurs via track circuits.
Section 6: Installation of Double Line Block Instruments:
- Quick-acting relays aren't permitted.
- Tandem relays (DC or AC) and DC 3-position relays are required.
- Block release operates using sequential track circuits.
Section 7: Maintenance of Token Instruments - General:
- Maintaining registers with instrument data, installation dates, and overhaul schedules.
- Token inventories
Section 8: Maintenance of Block Instruments & their Ancillary Apparatus:
- Regular testing of electrical, mechanical, and contact components.
- Proper adjustment of springs and armatures. Checking of all wiring and components. Maintaining earth connections.
Section 9: Maintenance of Single Line Block - Instructions:
- Care for safety catch, spring clutch (free movement without friction).
- Inspection and lubrication of token indicator pin.
- Inspection and adjustment of rocker arm.
- Ensuring all parts are in correct shape and condition.
Section 10: Maintenance of Block Proving by Axle Counter:
- Monitoring axle counter parameters.
- Correct signal levels.
Section 11: Maintenance of Embedded type Block working:
- Maintenance as per Electronic interlocking/VDU schedule.
Section 12: Intermediate Block Signalling (IBS):
- Splitting a long block into rear and advance sections.
- Track section (rear/advance) starts and ends at specified points.
- Train entry into rear/advance sections regulated by specific points.
Other Notes:
- Block instruments may use special PVC-insulated quads or other suitable communication methods.
- Lightning dischargers are needed for power-line noise protection,
- Appropriate earthing is important.

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Description

Test your knowledge on the safety and operational requirements for block instruments used in railway systems. This quiz covers general and special requirements to ensure robust and secure functionality. Understand the specifications for both traditional and tokenless block instruments.