Broad-gauge trackbed ballast specs on coastal line: sea-spray salt crusting and tie degradation?
How do SLR permanent-way engineers combat saline corrosion of steel fastenings and ballast fouling between Mount Lavinia and Payagala?
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3 Answers from travellers
The coastal railway line runs within 30 meters of the breaking surf, exposing trackbeds to continuous airborne sea-spray and sand blowing. Salt crusts cake crushed granite ballast, cementing stones together into an impermeable matrix that destroys track elasticity and drainage. SLR engineers mandate frequent ballast tamping and shoulder screening, using pre-stressed concrete sleepers (PSC) fitted with heavy-duty galvanized steel Pandrol clips and thick insulating rubber pads. Steel fishplates and bolts must be coated with heavy bitumen grease quarterly to prevent severe chloride stress corrosion cracking.
High monsoon waves frequently breach shoreline revetments, depositing beach sand over the rails that must be cleared by hand crews before express trains run.
Trackside signaling cables are encased inside sealed PVC conduit pipes elevated on concrete posts to prevent saltwater ingress from shorting track circuits.
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