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What is ‘through’ or ‘scattered’ renewal?

19-07-2019

Complete Track Renewal (CTR) refers to the most thorough track replacement regime where rails, sleepers, etc., are fully replaced. Through Rail Renewal (TRR) refers to the replacement of rails in a given section of track, while Through Sleeper Renewal (TSR) refers to the replacement of sleepers. Similarly, there are Through Turnout renewal (TTR), Through Fitting Renewal (TFR), Through Weld Renewal (TWR), and Through Bridge Timber Renewal (TBTR). Each of these has a more thorough ('primary') and less thorough ('secondary') versions, hence you see the acronyms like 'CTR(P)' for 'Complete Track Renewal - Primary', or 'TSR(S)' for 'Through Sleeper Renewal - Secondary. Additionally there are

Are there any in-cab signalling methods, ATP, etc. used by IR?

July 16, 2019

Some WAP / WAM models have in-cab AWS / ATS (auxiliary warning system, automatic train stop). AWS provides prior in-cab notification of distant or home signals that are displaying danger or 'on'. ATS provides for a locomotive to be brought to a halt in case it overshoots an 'on' signal that it should not have. This has been tried out on the

Does IR use automatic track-side hot-spot detectors, trailing equipment detectors, etc.?

July 16, 2019

IR does not appear to have begun using any hotspot detectors or trailing equipment detectors or other methods for automatic detection of mechanical problems in rolling stock, apart from some isolated experiments. Axle counters or track circuits are the primary means of ensuring that a section of track is clear - problems from broken or detached

Does IR use any other method of Last Vehicle Proving

July 16, 2019

Apart from axle counters or track circuits that indicate that a train has passed out of a section of track, in some places magnetic detectors are used for last vehicle proving. A permanent magnet suspended a few inches above the track from the last vehicle of a train passes right over a sensor which is positioned in the center of the track. The

What kinds of axle counters does IR use?

July 16, 2019

Axle counters are widely used by IR to ensure that all wagons or coaches of a train have indeed passed a given point — out of a block section, out of the station limits, out of yard limits, other point zones, etc. ('last vehicle proving', 'block proving', or 'block verification', serving the same purpose as the visual 'Last Vehicle Check' or LVC

What kinds of track circuits are used by IR?

July 16, 2019

The most common form of track circuit used is the detection of a train by the closing of an electrical circuit between the two rails because of the conducting nature of the rolling stock. This circuit may use DC in the simplest form, or may use AC, at various frequencies or with coded pulses. DC Track Circuit (double-rail) Double-rail DC track

What are Locking Tables and Pull Sheets?

July 16, 2019

A Locking Table is a table that gives the complete set of interlocking relationships among signal and point levers in a cabin. A Pull Sheeet is similar, in that it conveys the same information, but is geared towards the lever operator's convenience in showing which other levers need to be pulled for any lever. A sample locking table is shown

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What is ‘through’ or ‘scattered’ renewal?

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