Signalling Essentials Chapter Overview

The minimum distance is not less than 1 kilometre.

The second Distant Signal must be placed at a distance of not less than 2 kilometres.

It serves as a marker to indicate the presence of Distant signals.

<p>The Home Signal shall be placed in rear of all connections on the line.</p> Signup and view all the answers

<p>The Home Signal should be placed at not less than 180 metres in rear of the points.</p> Signup and view all the answers

<p>A Red signal indicates 'Stop'.</p> Signup and view all the answers

<p>A Double Yellow signal indicates 'Attention'.</p> Signup and view all the answers

<p>A Green signal indicates 'Proceed'.</p> Signup and view all the answers

<p>It indicates that the Loco-pilot should be prepared to stop short of any obstruction.</p> Signup and view all the answers

<p>It displays a miniature yellow light in the 'OFF' position.</p> Signup and view all the answers

<p>It should be placed below a Stop Signal that governs the approach of a train.</p> Signup and view all the answers

<p>No, the Calling-on Signal shall not be capable of being worked at the same time as the Stop signal above it.</p> Signup and view all the answers

<p>All level crossing gates in the route must be closed and locked against road traffic.</p> Signup and view all the answers

<p>A 5 rail length (65 metres) Calling-on track circuit is required.</p> Signup and view all the answers

<p>It ensures that the Calling-on Signal is taken 'OFF' only after the train has been brought to a stop.</p> Signup and view all the answers

<p>The Station Master extends control over the Calling-on Signals.</p> Signup and view all the answers

<p>The signals in rear should either be controlled by the signal in advance or they shall be combined.</p> Signup and view all the answers

<p>The warning board should normally be on the left of the line.</p> Signup and view all the answers

<p>The legend on the board should read 'Approaching unwarned Stop Signal'.</p> Signup and view all the answers

<p>An indication board with the legend 'Entering Token Territory' should be provided.</p> Signup and view all the answers

<p>The legend should read 'Entering Absolute Block Territory' or 'Entering Automatic Block Territory'.</p> Signup and view all the answers

<p>It indicates where shunting in the face of an approaching train is permitted.</p> Signup and view all the answers

<p>The indication board should be fixed at not less than 1.4 km in rear of the First Stop Signal.</p> Signup and view all the answers

<p>Self-reflecting sheets of approved type or reflectors must be provided.</p> Signup and view all the answers

<p>The principle of route setting is based on the 'Entry/Exit' method.</p> Signup and view all the answers

<p>Signal clearance can be achieved by an individual push button together with a group button or by an individual switch controlling each signal.</p> Signup and view all the answers

<p>SM's Key control arrangement is implemented to prevent unauthorized operations.</p> Signup and view all the answers

<p>Emergency route release is provided on the control panel and recorded through a non-resettable counter for each operation.</p> Signup and view all the answers

<p>All emergency operations must be a two-step process to safeguard against unintended operations.</p> Signup and view all the answers

<p>Locking and sealing arrangements are required to secure covers against unauthorized opening.</p> Signup and view all the answers

<p>The control panel must include Point, Route, Signal, Track Circuit, and Power Supply indications.</p> Signup and view all the answers

<p>Control Terminals should be of appropriate size to display the layout of the Yard clearly and in well-proportioned dimensions.</p> Signup and view all the answers

<p>To ensure the proper functioning and reliability of the signaling systems before they are put into operation.</p> Signup and view all the answers

<p>Industry's best practices, safety, reliability, availability, and sectional needs.</p> Signup and view all the answers

<p>Drawings are provided for guidance, which can be modified based on site-specific needs and equipment sizes.</p> Signup and view all the answers

<p>By referring to the Important Minimum Signalling Features outlined in Table -3.</p> Signup and view all the answers

<p>Air conditioning, automatic fire detection and alarm systems, and automatic fire suppression systems.</p> Signup and view all the answers

<p>Operation should be carried out through appropriate dropdown menus or other approved means.</p> Signup and view all the answers

<p>Indications like TGT, TCF, LC, etc., required for block working must be displayed.</p> Signup and view all the answers

<p>The design must comply with the criteria given in Chapter 21, Section 1.</p> Signup and view all the answers

<p>Outdoor signalling equipment must be installed, tested, and maintained as specified in the relevant chapters of SEM.</p> Signup and view all the answers

<p>Power supply systems must adhere to the stipulations given in Chapter 16 of SEM.</p> Signup and view all the answers

<p>Lightning and surge protection must be provided according to Chapter 21, Section 7.</p> Signup and view all the answers

<p>Block instruments must be installed, tested, commissioned, and maintained as per Chapter 18.</p> Signup and view all the answers

<p>All signalling equipment and circuitry must comply with Chapter 22 on requirements in 25 KV AC electrified areas.</p> Signup and view all the answers

<p>Red target.</p> Signup and view all the answers

<p>Green light.</p> Signup and view all the answers

<p>Target type indicators.</p> Signup and view all the answers

<p>Edge of the disc.</p> Signup and view all the answers

<p>When a green light would mislead the Loco pilot.</p> Signup and view all the answers

<p>Disc or Light type indicator.</p> Signup and view all the answers

<p>Trap points are closed.</p> Signup and view all the answers

<p>White light.</p> Signup and view all the answers

<p>The Inner Distant Signal provides advance warning to trains and must be placed not less than 1 km in rear of the First Stop Signal.</p> Signup and view all the answers

<p>The color scheme provides distinct visual cues: Red for Stop, Yellow for Caution, Double Yellow for Attention, and Green for Proceed.</p> Signup and view all the answers

<p>It must be placed at an adequate distance of not less than 1 kilometer in rear of the first Stop Signal.</p> Signup and view all the answers

<p>The white disc with 'P' indicates the presence of Distant and Inner Distant Signals, ensuring visibility and recognition.</p> Signup and view all the answers

<p>The Home Signal should be placed in rear of all connections on the line it refers to, at least 180 meters behind the obstructed points.</p> Signup and view all the answers

<p>If the EBD is more than 1.0 km, a second Distant Signal must be installed at least 2 km from the First Stop Signal.</p> Signup and view all the answers

<p>A warning board must be positioned to ensure safety, as insufficient distance may lead to confusion or accidents.</p> Signup and view all the answers

<p>A 'Caution' signal is indicated by a Yellow aspect, warning the train to prepare for possible stop ahead.</p> Signup and view all the answers

<p>Through running may be permitted to prevent trains from standing at a Stop Signal on a rising grade or to operationally receive trains from different directions at the same time.</p> Signup and view all the answers

<p>The minimum equipment includes a gauge tie plate, a facing point lock, and a control mechanism secured with a key.</p> Signup and view all the answers

<p>An appropriate speed limit must be imposed, along with an 'S' marker and a speed indicator at least 30 metres from the Points.</p> Signup and view all the answers

<p>The caution and termination indicator serves to alert trains of speed restrictions and signals the end of such restrictions.</p> Signup and view all the answers

<p>The control mechanism ensures that the Points are properly set and locked, preventing accidental misalignment during train operations.</p> Signup and view all the answers

<p>Annexure 7-A1 provides detailed rules for the opening of railway lines including protocols for Isolation.</p> Signup and view all the answers

<p>Considerations should include the reliability of equipment, interlocking with block systems, and operational safety.</p> Signup and view all the answers

<p>Approved special instructions ensure that operational safety is maintained while allowing for necessary adjustments in train operations.</p> Signup and view all the answers

<p>The complete arrival or despatch of the train.</p> Signup and view all the answers

<p>When block instruments fail or a train is still in the Block section and another train needs to be despatched.</p> Signup and view all the answers

<p>All points in the route, including overlap and isolation, must be correctly set and locked.</p> Signup and view all the answers

<p>It shall not be possible to move any points or unlock the route until the signal is replaced to 'ON' position.</p> Signup and view all the answers

<p>Interlocking mechanisms are put in place to avoid conflicting movements.</p> Signup and view all the answers

<p>On the passage of a train or by Emergency Route Release with specified Time Delay.</p> Signup and view all the answers

<p>All relevant tracks must be unoccupied by vehicles.</p> Signup and view all the answers

<p>It ensures safe operation by preventing immediate release of the signal after a train passes.</p> Signup and view all the answers

<p>They must conform to the approved signalling plans, Control Table, and detailed wiring diagrams.</p> Signup and view all the answers

<p>The criteria are outlined in Chapter 21, Section 1.</p> Signup and view all the answers

<p>Outdoor signalling equipment must be installed, tested, and maintained as per specified guidelines.</p> Signup and view all the answers

<p>They must comply with the requirements outlined in Chapter 22 of SEM.</p> Signup and view all the answers

<p>Lightning and surge protection is required to safeguard them from electrical surges.</p> Signup and view all the answers

<p>Power supply systems must adhere to the provisions outlined in Chapter 16 of SEM.</p> Signup and view all the answers

<p>Track circuits, AFTC, and Axle Counters must be provided as per Chapter 17 of SEM.</p> Signup and view all the answers

<p>Block instruments must be installed, tested, commissioned, and maintained according to Chapter 18.</p> Signup and view all the answers

<p>The trap switch should be located with the heel of the switch behind the fouling mark and preferably on the straight.</p> Signup and view all the answers

<p>Method B ensures that the short dead end siding is not long enough to stabling vehicles unless a trap is provided at least 180 meters away.</p> Signup and view all the answers

<p>A train must not be admitted on to the trapped line unless the trap has been closed.</p> Signup and view all the answers

<p>A sand hump of approved design should be used as a substitute to provide the adequate distance.</p> Signup and view all the answers

<p>Trains must not be admitted unless the trap is set and locked against vehicles in the dead end siding.</p> Signup and view all the answers

<p>The trap switch's location away from the line to be protected is critical for ensuring safe isolation of the running lines.</p> Signup and view all the answers

<p>The trap must be provided at a distance of not less than 180 meters from the starter signal.</p> Signup and view all the answers

<p>The points of the dead end siding should be set for the crossover and against the siding before admitting a train.</p> Signup and view all the answers