Double Line Block Instruments Overview

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Questions and Answers

What should not be adopted when seeking and granting Line Clear in suburban and quadruple line sections?

Use of attention signals

Repeating signals

Acknowledging train signals

Exchange of private numbers (correct)

What does sending the 'Attention Signal' from Station X to Station Z signify?

A clarification of the bell code

A request for departure signals

A notification of a pending train arrival (correct)

An acknowledgment of Line Clear

How does Station Y acknowledge the 'Is Line Clear' signal?

By sending a new signal

Through exact repetition on the last beat (correct)

By discontinuing the signal process

By turning its Block Instrument to the left

What action follows Station Y's receipt of the last beat of acknowledgment?

Taking off departure signals for the train Signup and view all the answers

What signal does Station Z send after the departure of the train from Station Y?

Attention Signal Signup and view all the answers

What is indicated when the upper needle shows 'Line Clear'?

Permission has been given for a train to enter the block section. Signup and view all the answers

Which part of the double line block instrument indicates the condition of the block section in advance?

The upper needle Signup and view all the answers

What does the lower needle indicate when it shows 'Train on Line'?

A train is currently present in the block section. Signup and view all the answers

Who controls the upper needle of the double line block instrument?

The Station Master at the block station in advance Signup and view all the answers

What color segment indicates that the line is closed on the block instrument?

White Signup and view all the answers

What action alters the indication of the upper needle?

Direct control by the Station Master Signup and view all the answers

What does the 'Line Closed' indication signify?

There is no train in the block section and permission is not given for entry. Signup and view all the answers

What is the purpose of Block Bells?

To provide an audible signal according to the code of bell signals Signup and view all the answers

What is the first step taken when governing the movement of trains between stations?

Attention Signal is sent Signup and view all the answers

What is necessary to confirm that the correct stations are in communication?

Station names must be exchanged via telephone Signup and view all the answers

What should NOT be adopted when exchanging Private Numbers during Line Clear procedures?

In case of suburban sections Signup and view all the answers

What signal does Station Y send after receiving the 'Attention Signal' from Station X?

Acknowledgment of Attention Signal Signup and view all the answers

How many beats represent the 'Is Line Clear' signal sent by Station Y to Station Z?

Two beats Signup and view all the answers

What information does Station Z provide to Station Y to confirm Line Clear?

The number and description of the train Signup and view all the answers

What operation occurs after Station Z gives the Line Clear?

Another Attention Signal is sent to Station Y Signup and view all the answers

What is indicated by the Block Instruments showing 'Line Closed'?

The track is currently occupied or unsafe Signup and view all the answers

What is the correct procedure after the 'Call Attention' beat has been acknowledged?

Exchange station names on the telephone Signup and view all the answers

What does the lower needle of the Block Instrument indicate?

The condition of the Block section for trains approaching from either direction Signup and view all the answers

Which position indicates that the Block Instrument shows ‘Line Clear’?

The pointer on the face of the Commutator is directed to the right (Segment-Green) Signup and view all the answers

Under what condition is the Commutator locked in the ‘Train on Line’ position?

When the ‘Line Clear’ indication has been previously given Signup and view all the answers

What should occur immediately after the Bell Code (GR-14.05) is signalled?

The Commutator should be turned before releasing the Bell Plunger Signup and view all the answers

What action must be taken to lock the Commutator in the ‘Train on Line’ position?

Ensure the train has cleared the station and operate a treadle or track circuit Signup and view all the answers

What happens if the Commutator is turned directly from ‘Line Closed’ to ‘Train on Line’?

It does not become locked Signup and view all the answers

How many positions does the Commutator have?

Three positions Signup and view all the answers

What is the primary purpose of the Bell Plunger?

To signal trains on the prescribed Code of Bell signals Signup and view all the answers

What is the response to the 'Is Line Clear' signal?

Acknowledge by an exact repetition and turning the commutator to the right Signup and view all the answers

When does a station take off the departure signal for the train?

Upon seeing that the instrument points to 'Line Clear' Signup and view all the answers

What action is taken after the train departs?

Sends an 'Attention Signal' to the next station Signup and view all the answers

How is the 'Train entering section' signal acknowledged?

By an exact repetition and turning the commutator to the left Signup and view all the answers

What is done after the departure signals are returned to 'ON'?

Attend to the telephone Signup and view all the answers

What information is provided when asking for 'Line Clear' on the telephone?

The train number and description with Private Numbers Signup and view all the answers

What operation is performed upon sending an 'Attention Signal'?

Signals the other station to prepare for train arrival Signup and view all the answers

How does a station acknowledge the 'Attention Signal' from another station?

By sending back a similar signal Signup and view all the answers

What does the station do after acknowledging the 'Train entering section' signal?

Sends a departure signal to the next station Signup and view all the answers

What must be done before turning the commutator for 'Line Clear'?

Listen for the last beat of the signal Signup and view all the answers

What is the procedure followed by Station Y upon receipt of the 'Is Line Clear' signal?

Takes off the departure signals immediately Signup and view all the answers

Which step does Station Z perform after receiving the 'Train entering section' signal from Station Y?

Acknowledges the signal by sending a confirmation back to Station Y Signup and view all the answers

What does the exact repetition of the acknowledgment signal from Station Y to Station Z represent?

Acceptance of the 'Is Line Clear' signal Signup and view all the answers

What action does Station Z take immediately after acknowledging that the upper needle points to 'Line Clear'?

Turns the commutator to 'Train on Line' Signup and view all the answers

What is indicated if Station Z sends an 'Attention Signal' to Station Y after the train's departure?

The block section is now clear for additional trains Signup and view all the answers

What does the Normal position of the Commutator indicate?

Line Closed Signup and view all the answers

Which component is responsible for signaling trains using a specific code?

Bell Plunger Signup and view all the answers

Under what condition does the Commutator remain locked in the 'Train on Line' position?

When 'Line Clear' indication was previously given Signup and view all the answers

What happens if the Commutator is turned directly from its normal position to 'Train on Line'?

It remains unlocked Signup and view all the answers

Which segment color on the Commutator indicates 'Line Clear'?

Green Signup and view all the answers

What specifically triggers the operation of the lower needle of the Block Instrument?

Turning the Commutator Signup and view all the answers

What is required before releasing the Bell Plunger?

The Bell Code must be signalled Signup and view all the answers

What indication does the Commutator pointer show in the Train on Line position?

Segment-Red Signup and view all the answers

Which of the following indicates a condition of the Block sections approaching from either direction?

Lower needles Signup and view all the answers

Which indication is shown when there is no train in the Block Section and permission has not been granted?

Line Closed Signup and view all the answers

How does the upper needle's indication differ from the lower needle's indication?

Upper needle indicates forthcoming conditions, lower needle indicates preceding conditions. Signup and view all the answers

What color segment indicates 'Line Clear' on the double line block instrument?

Green Signup and view all the answers

Which component of the block instrument is primarily operated by the Station Master at the block station?

Upper Needle Signup and view all the answers

What occurs when the Commutator is locked in the 'Train on Line' position?

Train movements are restricted for safety. Signup and view all the answers

Which statement best describes the role of the lower needle on the block instrument?

It gives information about trains entering the block section. Signup and view all the answers

What is the main function of the Bell Plunger within the block instruments?

To transmit signals between stations. Signup and view all the answers

What is the purpose of the 'Call Attention' beat before conducting train movements?

To confirm the communication link between the stations involved. Signup and view all the answers

What specific action does Station Z take after receiving the 'Line Clear' signal from Station Y?

Confirms the 'Line Clear' on telephone. Signup and view all the answers

How does Station Y acknowledge the 'Is Line Clear' signal from Station Z?

By repeating the previous acknowledgment. Signup and view all the answers

What is the correct sequence of communications between Station X and Station Y when governing train movement?

Send 'Attention Signal', receive acknowledgment, ask 'Line Clear'. Signup and view all the answers

During the process of seeking 'Line Clear', what must be avoided in suburban and quadruple line sections?

Using Private Numbers during the communication. Signup and view all the answers

Which step is taken immediately after exchanging the names of stations during train movement governance?

Sending the 'Is Line Clear' signal. Signup and view all the answers

What beat sequence is prescribed for sending the 'Is Line Clear' signal?

Two beats. Signup and view all the answers

What is the first action taken by Station Y after it receives the 'Attention Signal' from Station X?

Acknowledges the 'Attention Signal' to Station X. Signup and view all the answers

What should Station Z provide to Station Y to confirm that the train is ready for departure?

Confirmation of 'Line Clear'. Signup and view all the answers

What action is required after Station Y acknowledges the 'Is Line Clear' signal?

Station Y takes off the departure signal for the train. Signup and view all the answers

How does Station Z acknowledge receipt of the 'Train entering section' signal?

By an exact repetition and turning the commutator to the left. Signup and view all the answers

What does Station Y do immediately after the train passes the last stop signal?

Returns the departure signals to 'ON'. Signup and view all the answers

What does the upper needle of the Block Instrument indicate when it points to 'Line Clear'?

The route is free for the train to depart. Signup and view all the answers

What must be done before returning the departure signals to 'ON'?

Confirming that the train has passed the last stop signal. Signup and view all the answers

What information does Station Z provide when asking for 'Line Clear' on the telephone?

The number and description of the current train. Signup and view all the answers

What is the primary function of the commutator in the Block Instrument?

To indicate the status of train movements. Signup and view all the answers

How is the factual acknowledgment of the 'Attention Signal' done by Station X?

By an exact repetition and activating the commutator. Signup and view all the answers

What is the first action that should be taken when asking for 'Line Clear'?

Sending the number of the train. Signup and view all the answers

Which signal is sent by Station X after departing the train?

An 'Attention Signal' to Station Y. Signup and view all the answers

Study Notes

Double Line Electrical Block Instruments

Instruments used on Eastern Railway are three-position lock and block type
Various parts and functions are described below

Instrument Parts and Indications

Needles: Upper and lower needles indicate "Train on Line," "Line Closed," and "Line Clear." Colors used are red, white, and green, respectively, for different segments.
Commutator: Has three positions (normal, line clear, train on line) indicated on the face using segments
- Normal: Line Closed (white segment), pointer vertical.
- Line Clear: Line Clear (green segment), pointer to the right.
- Train on Line: Train on Line (red segment), Pointer to the left.
Bell Plunger: Operates a bell at the other end of the block section when pressed.
Block Bells: Audible signals by means of a code (GR-14.05)

Needle Indications

Line Closed: No train in the block section and no permission for entry
Line Clear: Permission for a train to enter the block section has been given
Train on Line: Block section is occupied by a train

Upper Needle

Shows the condition of the block section in advance of a train leaving the station
Controlled by the station master in the immediately preceding block station
Upper needle's indications correspond with the lower needle of the adjacent instrument

Lower Needle

Shows the condition of the block section behind a train approaching a station
Controlled entirely by the station master at the instrument's station
Lower needle’s indications correspond with the upper needle of the instrument in the rear station

Relation to Block Sections

Two instruments at each station: one for up direction and one for down direction.
Lower needles indicate block conditions for trains approaching either direction.
Upper needles indicate block conditions for trains leaving the station in either direction.

Commutator

Turns the lower needle of the block instrument, and the upper needle of the instrument at the adjacent cabin.
Three positions:
- Normal: Line Closed (white segment), pointer vertical
- Line Clear: Line Clear (green segment), right-pointing pointer.
- Train on Line: Train on Line (red segment), left-pointing pointer.
Locked in "Train on Line" only after a "Line Clear" indication.
Locked until a train clears the station.
Turning from normal to "Train on Line" does not lock the commutator.
Turn commutator after Bell Code has been announced (GR-14.05) and before releasing the Bell Plunger.

Block Bells

These bells sound a code (GR-14.05)
Audible signal when used in the prescribed manner

Train Movement Control

Station-to-station communication via telephone to ensure correct station assignments.
Exchange of train details and Line Clear confirmations.
Sequence of signals (Attention Signal, Line Clear, Train entering, Train out, and confirmation) by stations in order.

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Description

This quiz covers the key aspects of double line electrical block instruments used on the Eastern Railway. Learn about the components, such as needles and commutators, and their indications for train movement. Gain insights into the signaling mechanisms that ensure safe railway operations.