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Friday 30 October 2026 19:24:48 GMT
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2026-10-30 20:31:09
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Check it im a scary black cat
Check it im a scary black cat
Có ngày ông cho m phát #vtmgr
Có ngày ông cho m phát #vtmgr
Buruk suda rupa baby dia tp tatap dia syg. Makan,mandi,main dan tdur smua dia bawa..😂
Buruk suda rupa baby dia tp tatap dia syg. Makan,mandi,main dan tdur smua dia bawa..😂
Why are there gaps between railway tracks? It's not bad construction — it's physics doing its job. Steel rails expand on hot days and contract in the cold. A 25-meter rail can grow over 7 mm with just a 25°C temperature swing. Without expansion gaps, that thermal stress builds until the track buckles — what railway engineers call sun kink — derailing trains and tearing the line apart. Modern continuously welded rail (CWR) eliminates most of these joints by pre-stressing the steel at a
Why are there gaps between railway tracks? It's not bad construction — it's physics doing its job. Steel rails expand on hot days and contract in the cold. A 25-meter rail can grow over 7 mm with just a 25°C temperature swing. Without expansion gaps, that thermal stress builds until the track buckles — what railway engineers call sun kink — derailing trains and tearing the line apart. Modern continuously welded rail (CWR) eliminates most of these joints by pre-stressing the steel at a "neutral temperature," but the principle is the same: account for thermal expansion or pay the price. Every joint, every gap, every centimeter of clearance — engineered, not accidental. Follow @structboard for more engineering breakdowns 🛤️ #StructBoard #CivilEngineering #StructuralEngineering #Railway

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