Does IR operate diesel-electric or diesel-hydraulic multiple units of any kind?

14-07-2019

There are several diesel-electric multiple units (DEMUs) and diesel-hydraulic multiple units (DHMUs) in operation. Most are made by ICF. The BG DEMUs have a Cummins VTA 1710 V-12 prime mover of 705 HP, whereas the BG DHMUs have two 350hp underfloor engines (Cummins 855R) driving two separate Voith hydraulic transmissions via propeller shafts and differentials. These have a rated maximum speed of about 105km/h. The first units were introduced in 1993-94. A newer variant of the DEMU from ICF has been spotted on the Ahmedabad - Abu Road section with two underslung Cummins NT 855R engines each driving a traction alternator whose output is fed to 4 traction motors. A new aerodynamically

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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),

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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.

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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

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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 -

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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

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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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