Main Line railway culvert drainage: masonry arch maintenance on steep mountain cuttings?
How do SLR permanent-way maintenance crews clear sediment and inspect granite drain arches on steep 1-in-44 rail embankments between Hatton and Kotagala?
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3 Answers from travellers
The steep mountain cuttings of the Main Line between Hatton and Kotagala receive over 4,000mm of annual rainfall during monsoon seasons. To prevent slope washouts from de-stabilizing ballast beds, the trackbed is served by hundreds of colonial dressed-granite culverts and brick arch drains. SLR permanent-way gang workers (Track Patrolmen) inspect every culvert barrel weekly. Workers clear fallen tree debris, tea field silt, and bamboo root intrusions from culvert throats using iron drag-hoes, ensuring torrential stormwater discharges freely down mountain ravines.
Blocked culverts cause water to pool behind railway embankments, creating hydrostatic pressure that triggers deep rotational slope slips under heavy trains.
Engineers use digital inclinometers to monitor track cross-level alignment over high stone arch culverts after prolonged monsoon downpours.
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