What is ‘through’ or ‘scattered’ renewal?

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What is ‘through’ or ‘scattered’ renewal?

July 19, 2019, 12:10 PM

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 ‘Casual’ renewals, which refers to renewals of any kind that happen not on a predetermined schedule but as determined based on patrolling and inspection of tracks, in small continuous stretches. Finally, ‘Scattered’ renewal (SR) refers to ad hoc replacements that happen at isolated points.

Source – IFRCA.org

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