Sandite is a mixture of sand and a special chemical compound used by railways to improve traction on tracks, particularly during wet or icy conditions. The sand is spread onto the rails, usually by a special vehicle, to prevent train wheels from slipping. When trains are operating in snowy, icy, or rainy weather, the sandite helps to keep the wheels from losing grip, allowing the trains to move safely and efficiently. It is especially useful in areas where weather conditions frequently affect train performance, helping to maintain a smooth and safe journey.

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