Why do you need to cool down train tracks?

Rails are made of steel which expands as it heats up. If trains go too fast they risk buckling the track. While the air temperature might be 31C, temperatures on tracks can exceed 50C during heatwaves. Just a few hours of above-average heat is enough to cause problems.



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This stress can cause railway steel to fracture. In extreme heat, a length of CWR suffers compressive stress. This type of stress can cause sun kink where a length of a railway buckles laterally (sideways).

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Railroad engineering departments and train operators coordinate “slow orders,” reductions in speeds in order to avoid derailments when air temperatures exceed 100°. At an air temperature of 110°, the temperature of the rails themselves can often reach 140°.

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Just as people can suffer sunburn or heat stroke from too much exposure to sunlight and hot temperatures, rail can bend or warp because of a blistering sun and sweltering temps. If the rail malformations known as a sun kink or track buckle aren't repaired in a timely manner, trains can derail.

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The estimated accident rate in 2019 is 0.85 fatal collisions or derailments per billion train-kilometres, which represents a fall of 78% since 1990.

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Railways. Steel rails expand and tend to buckle in the heat – whatever the climate. According to Network Rail, railways worldwide are designed to operate within a 45C (81F) range, according to the local conditions.

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Worst accidents The worst accident was the Quintinshill rail disaster in Scotland in 1915 with 226 dead and 246 injured. Second worst, and the worst in England, was the 1952 Harrow and Wealdstone rail crash, which killed 112 people and injured 340.

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Worst accidents The worst accident was the Quintinshill rail disaster in Scotland in 1915 with 226 dead and 246 injured. Second worst, and the worst in England, was the 1952 Harrow and Wealdstone rail crash, which killed 112 people and injured 340.

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The A897 between Helmsdale and Halladale Bridge, near Melvich, runs through several vast areas of wilderness and hamlets such as Kildonan, Kinbrace, Forsinard and Achiemore. Official data gathered by the Department for Transport shows that the road only has 416 cars per year.

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On railways, cant helps a train steer around a curve, keeping the wheel flanges from touching the rails, minimizing friction, wear and rail squeal. The main functions of cant are the following: Improve distribution of the load across both rails.

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