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What is the ‘Raksha Dhaga’? What other methods does IR use to warn of landslides and rockfalls?

19-07-2019

'Raksha Dhaga' or literally, 'Safety Thread', is a device pioneered by Konkan Railways in landslide-prone areas. It consists of a wire attached to sensors which can be tripped when the wire is moved excessively or snapped by a falling rock. The sensors when tripped activate lights and hooters 0.5km away so that approaching trains can safely stop before the location of the landslide. These are used in several stretches on the KR route in cuttings and in unlined tunnels. In addition, KR has pioneered the use of electronic inclinometers to detect earth slippages in areas prone to landslides, connected to a similar warning system as in the Raksha Dhaga. Source -

What does it mean when a colour-light signal does not face along the tracks but points away?

July 14, 2019

Colour-light signals that are not in use (just set up but not yet commissioned, or in the process of being decommissioned) are often turned to point away from the tracks, so that it is clear to all locomotive drivers that the signal is not in service. Otherwise, it would be treated as an active signal that is malfunctioning (lamps burnt out),

What do the rings, bars, etc. found on some signals mean?

July 14, 2019

Stop signals controlling the approach to goods yards or goods-only lines have a black ring fixed to the end of the semaphore arm. No corresponding indication is provided in colour-light territory. Similarly, semaphore signals controlling lines for dock platforms have a black semicircle (in the shape of a 'D') fixed to the end of the semaphore arm.

How do signals refer to specific lines in the case of diverging and converging routes?

July 14, 2019

Multiple signals may be mounted on a signal assembly (bracket post, signal gantry, etc.) to provide signal indications for diverging routes. The signals from left to right correspond to the diverging routes from left to right. If one of the routes is the main line, the signal for it is usually placed higher than the others (the maximum permissible

What are running signals and subsidiary signals?

July 14, 2019

Running signals are the normal signals that control the movement of regular trains. Subsidiary signals are those that control other movements such as shunting, or which provide additional information (repeater signals, points indicators, etc.). Source -

What indications do signals show and what do they mean?

July 14, 2019

The most common indications shown by various signals are the following: Stop This requires a train to stop dead and not pass the signal except under special instructions or emergency procedures. (Stop signals may be passed after halting and waiting in automatic block territory – usually 1 min. during the day & 2 min. during the night.) This

What are the systems of colour-light signalling used by IR?

July 14, 2019

There are three systems of colour-light signalling in use. (In IR terminology, the term Multiple-Aspect Colour-Light signalling includes both 3- and 4-aspect signalling, and 2-aspect signalling is usually treated as a variant of 2-aspect semaphore signalling. Hence the classification below is not the same as IR's.) Two-aspect colour-light

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What is the ‘Raksha Dhaga’? What other methods does IR use to warn of landslides and rockfalls?

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