Block Instrument Maintenance and Inspection

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

<p>Push Button Token less Block Instruments (A)</p> Signup and view all the answers

<p>Connection of the DC circuit through the plate or foil (A)</p> Signup and view all the answers

<p>They must be at the correct distance from the pole pieces (C)</p> Signup and view all the answers

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

<p>They should be maintained as per OEM manuals. (B)</p> Signup and view all the answers

<p>Follow OEM maintenance manual schedules. (B)</p> Signup and view all the answers

<p>Increases section capacity by splitting long block sections. (D)</p> Signup and view all the answers

<p>At the LSS of the rear station. (C)</p> Signup and view all the answers

<p>More frequent inspections as necessary. (A)</p> Signup and view all the answers

<p>Steeper gradients and signal visibility. (A)</p> Signup and view all the answers

<p>To ensure safety in signal transitions. (D)</p> Signup and view all the answers

<p>Ignoring OEM manual instructions. (D)</p> Signup and view all the answers

<p>It must be functional and free to move without friction. (C)</p> Signup and view all the answers

<p>Once a fortnight (D)</p> Signup and view all the answers

<p>Square and correctly shaped (A)</p> Signup and view all the answers

<p>Correctly shaped and square ended with width of 9.5 mm (C)</p> Signup and view all the answers

<p>The locks rocker arm (B)</p> Signup and view all the answers

<p>It should not be possible to take handle to 'Train Going To' position. (B)</p> Signup and view all the answers

<p>It should be replaced irrespective of its condition. (C)</p> Signup and view all the answers

<p>It should work only after full rotation and handle release. (A)</p> Signup and view all the answers

<p>The area between the IBS and home signal including block overlap (D)</p> Signup and view all the answers

<p>LSS of rear station (A)</p> Signup and view all the answers

<p>IBS system itself through its monitoring (B)</p> Signup and view all the answers

<p>White disc with letter 'IB' in black, indicating the IBS position (C)</p> Signup and view all the answers

<p>Co-operation of the other end Station Master (C)</p> Signup and view all the answers

<p>IB Distant signals alongside inner distant signals (A)</p> Signup and view all the answers

<p>By the IBS in that direction (D)</p> Signup and view all the answers

<p>Only one train is allowed when conditions are met (A)</p> Signup and view all the answers

The flexible cord and condenser of the block instrument telephone must be in good condition to isolate from the circuit; preventing current flow between circuits.

Receiver diaphragms must be free of buckling, and correctly positioned relative to the magnetic poles.

The receiver earpiece must fit correctly and be securely fastened.

If a pair of block instruments is situated in different contiguous railway/division sections, responsibility for maintenance is concentrated with one agency.

Single-line token block instruments undergo overhaul every 10 years, double-line instruments every 7 years, and handle-type single-line token block instruments every 7 years. Electronic block instruments do not require overhaul.

Block earths must be examined monthly by Section Engineer (Signal) and quarterly by Senior Section Engineer (Signal), plus resistance testing by Section Engineer /Senior Section Engineer every 12 months.

If block earth resistance exceeds 10 ohms, additional parallel earths must be installed to reduce the resistance.

In areas with AC electrification, two separate earthing systems are required – one for discharger and one for block earth.

Ensuring safety catch function, token indicator movement, and lock arm operation.

Validate free movement, oil the pin weekly, verify 'No token' lock function.

Confirm the lock's position (at least 1mm above) and ensure its square edge.

Replaces worn parts during overhauling (scheduled maintenance) of instruments.

Verify the pawl's correct shape, square end, and 9.5mm width.

Confirm the tablet holding arm release lever's functionality, and tablet release after rotation & handle release.

Check that instrument rack's notches are correctly shaped and square.

Follow tests outlined in section 18.5.2 during scheduled maintenance.

A type of signaling system that controls train movements within a block section. It uses a combination of signals, communication, and track circuits to ensure safe train operations.

A section of track monitored by an IBS system. Trains are allowed in only one at a time, preventing collisions.

The IBS coordinates with the rear station's LSS (Local Signal System) to allow trains into the IBS block section. The rear station controls entry.

The IBS grants permission for trains to enter its block section. It uses signals and track circuits to monitor the section and ensure safe operations.

The IBS system provides pre-warning signals to indicate potential issues within the block section, improving safety and preventing surprises.

The IBS coordinates with the rear station's LSS (Local Signal System) to allow trains into the IBS block section.

The IBS grants permission for trains to enter its block section by using signals and track circuits to monitor the section and ensure safe operations.

The IBS system provides pre-warning signals to indicate potential issues within the block section, improving safety and preventing surprises.

Procedures to reset the IBS system, typically involving the Station Master at the other end of the block section.

The IBS system uses axle counters to detect the presence and passage of trains within the block section.

The IBS system requires specific equipment and features, including distant and inner distant signals, communication facilities, and monitoring equipment.

Maintaining parameters of Axle Counter track equipment and UFSBI Block Panel within permissible values according to instructions and OEM manuals.

Ensuring signal levels at specific points of electronic equipment are within permissible limits as per laid-down instructions.

Maintaining Embedded type Block working based on Electronic Interlocking and VDU maintenance schedules from OEM manuals.

Ensuring all equipment connected with Electronic Interlocking (EI) related to Block working functions as per instructions.

IBS is used to increase section capacity by splitting a long block into rear and advance sections, enhancing train flow.

IBS is placed at the point of near bifurcation, considering factors like steep gradients, neutral sections, and visibility of signals.

The rear section starts from the rear station's LSS and ends at IBS, including a 400m block overlap.

The advance section starts from IBS and ends at the LSS of the next station, including a 400m block overlap.