Automatic Block System Signals Quiz

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Questions and Answers

What color signal does signal No.7 display when a train occupies section 7AT?

Double Yellow

Green

Red (correct)

Yellow

Which signal displays a Yellow aspect when the train is at section 7AT?

Signal No.3

Signal No.5 (correct)

Signal No.7

Signal No.1

Why is it important to maintain a distance between a red signal and a caution signal?

To prevent signal interference

To ensure the braking distance is met (correct)

To provide clearer visibility of signals

To allow for train acceleration

Which of the following statements about the sequence of signal aspects is true?

The sequence is Red, Yellow, Double Yellow, Green. Signup and view all the answers

What does a Double Yellow signal indicate?

Attention is required Signup and view all the answers

What automatically controls the movement of trains in an Automatic Block System?

Automatic stop signals Signup and view all the answers

Which of the following is a requirement for an Automatic Block System?

Line must be track circuited or equipped with axle counters Signup and view all the answers

What must be true for an Automatic Signal to change to 'OFF'?

The preceding section must be clear Signup and view all the answers

What is one advantage of the Automatic Block System?

Increased line capacity Signup and view all the answers

What does the illuminated 'A' sign indicate in an Automatic stop signal?

The signal is operating as an Automatic stop signal Signup and view all the answers

How long must a train stop at an automatic stop signal set at 'ON' during the day before proceeding?

1 minute Signup and view all the answers

Which of the following is NOT a characteristic of the Automatic Block System?

Allows manual signal overrides Signup and view all the answers

What color is the 'A' marker in Automatic stop signals?

Black on white Signup and view all the answers

What does the illuminated ‘A’ sign indicate when functioning as an automatic stop signal?

The level crossing gate is closed against road traffic Signup and view all the answers

When will the ‘AG’ sign be displayed on a level crossing gate signal?

When the LC gate is defective but points are set correctly Signup and view all the answers

What is a key feature of the automatic signalling section?

Control is maintained through automatic stop signals Signup and view all the answers

Which of the following statements about the level crossing gate signals is true?

Both ‘A’ and ‘G’ markers are used in automatic signalling Signup and view all the answers

In what scenario would the illuminated ‘A’ sign NOT appear?

When the level crossing gate is open to traffic Signup and view all the answers

What does the presence of multiple automatic stop signals indicate on the running road?

Sections are protected and automatically controlled Signup and view all the answers

What functional difference exists between automatic and semi-automatic signals?

Only semi-automatic signals require manual controls Signup and view all the answers

What happens when a train passes through an automatic stop signal?

The automatic signalling section becomes active Signup and view all the answers

What does the GECR circuit primarily indicate in terms of signal conditions?

Signal is operational Signup and view all the answers

Which component is essential for rear signal protection according to the GECR?

Front contact Signup and view all the answers

Which of the following components would be found in the signal layout depicted in the figures?

DECR Signup and view all the answers

How many TPR components are indicated in the provided automatic signal circuits?

3 TPR Signup and view all the answers

In the context of the automatic signalling layout, what does the term 'HR circuit' refer to?

Home route Signup and view all the answers

What is the minimum distance designated as 'overlap' for Automatic Signalling?

120 meters Signup and view all the answers

What is the primary function of the 3 RECR component in the diagram?

To control signal lights Signup and view all the answers

What aspect must an Automatic Stop Signal assume for it to change from 'ON' to 'OFF'?

The line must be clear for 120 meters beyond the next signal Signup and view all the answers

What does the term 'berthing track' refer to in the context of Automatic Signalling?

The portion of track beyond the overlap track Signup and view all the answers

Which of the components listed is indicated to be a part of the ECPR circuit?

ECPR1 Signup and view all the answers

When are 4-aspect signals required in Automatic Signalling?

When the distance between signals is less than breaking distance Signup and view all the answers

What acronym represents the rear signal circuit condition proven by the GECR?

HR Signup and view all the answers

In the context of signal circuit layouts, what does the 'T' in '8T' likely represent?

Track Signup and view all the answers

What is the purpose of defining the end of overlap for an Automatic Stop Signal?

To ensure the signal can change aspect safely Signup and view all the answers

What happens if the distance between signals is not adequate?

4-aspect signals must be implemented to improve capacity Signup and view all the answers

Why is it necessary to have overlapping track in Automatic Signalling?

To ensure correct aspect change and safety Signup and view all the answers

What does bifurcation of the track circuit at 120 meters imply?

It separates the overlap distance from the remaining track for signalling Signup and view all the answers

What condition causes the 3 GECR relay to pick up?

When any aspect is displayed on Signal No.1 Signup and view all the answers

Which relay is responsible for proving the Red lamp protection for Signal No.3?

3GECPR relay Signup and view all the answers

What does the 3 ECPR1 relay control?

1 HHR for displaying the Attention Aspect of Signal No.3 Signup and view all the answers

Which aspects cause the 3 ECPR2 relay to pick up?

Display of Green or Double Yellow aspects only Signup and view all the answers

What happens when the 3 GECR relay picks up at the Signal No.3 location?

The 3 TPR relay at Signal No.1 picks up Signup and view all the answers

Which condition is indicated for the 1 DR relay to function?

When 3 ECPR1 and 3 ECPR2 both pick up Signup and view all the answers

What is the primary role of the 1 HHR relay mentioned?

To display the Attention Aspect for Signal No.3 Signup and view all the answers

Which signal aspect must be displayed for 3 ECPR1 to pick up?

Any OFF aspect including Green and Yellow Signup and view all the answers

Study Notes

Automatic Block Signalling

Automatic Block Working: A train control system where train movement is governed by automatic stop signals.
Automatic signals operate automatically as trains enter and exit defined sections.
Essentials of Automatic Block System:
- Line track circuited or axle counters for automatic sections.
- Automatic signals for controlling train movement.
- Maintaining line clearance in advance of signals.
Automatic Block System Applications:
- Trains are controlled by stop signals throughout the line.
- Specific sections are governed by automatic stop signals.
Advantages of Automatic Block Signalling:
- Increased line capacity due to automatic train control.
- Reduced reliance on human intervention.
- Trains can stop safely at signals.
- Train movements are controlled by automatic stop signals.
- The line capacity increases, with less dependence on human agencies.
- Automatic stop signals can be passed at ON position per General Rule 9.02, after stopping one minute during the day and two minutes at night.
- Automatic signalling increases line capacity without needing more stations.

Markers in Automatic Stop Signals

'A' Marker: Black marker on a white background for all automatic block signals.
- Semi-automatic signals have illuminated 'A' markers.
- Illuminated 'A' sign indicates the signal is working as an automatic stop signal.
- Illuminated 'A' sign does not light when the signal operates as a manual stop signal.
'A' & 'G' marker at LC Gates:
- Yellow circular disc with 'G' and illuminated 'A'.
- 'A' marker lights when level crossing gates are closed.
Level Crossing Gate Signal (points in route): Illuminated 'A' and 'AG' signs are used.
- 'A' Sign lights when level crossing is closed, and points are set correctly.
- 'AG' sign lights if the level crossing gate is defective.

Automatic Signalling Sections

Automatic Signalling Section is defined as the part of running road between consecutive automatic signals.
Each part is protected by an automatic stop signal.
Automatic stop signals control train entry into these sections.
Signals operate automatically based on train movement.

Adequate Distance/Overlap and Berthing Track

Overlap distance: Minimum 120 meters of clear track beyond the next signal to allow the signal to go to the "OFF" position.
Berth track: Remaining track length beyond the overlap section.
Essential part of Automatic Block System.

Four-Aspect Automatic Signalling

Up to 3 aspects (Red, Yellow, Green) or 4 aspects (Red, Yellow, Double Yellow, Green).
Used when distances are shorter between signals or to improve line capacity.
The aspects sequence depends on whether the train has occupied one, two, three sections before the signal.

Automatic Signal Circuits

Circuits control signal indications based train position.
Different relays and contacts control signal display aspects.
Circuits ensure proper coordination between signals.

Controlling Circuit for Signal No. 1

3 GECR relay picks up when signal displays an aspect (Green, Double Yellow, Yellow, Red) and position.
This relay relays signal display status to another point.
Other relays control signal indications and aspects.

Exercise Questions

Advantages of automatic signalling
Procedure for passing a signal at danger
Adequate distance/overlap in automatic signalling
Various markers used, with details
Definition of berthing track
Lab model layout with 'A' and 'A' board signal counts

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Description

Test your knowledge on the Automatic Block System and its signal aspects with this quiz. You will answer questions about signal colors, their meanings, and the importance of maintaining distances between signals. Perfect for students and professionals in railway operations!