Why is sand sprinkled on railway tracks in hilly areas when it rains?

Sand is sprinkled on railway tracks in hilly areas during rain to improve traction between the train wheels and the rails. Wet conditions can cause the tracks to become slippery, increasing the risk of wheel slip and reducing braking effectiveness. The sand acts as a friction agent, helping to maintain the necessary grip for safe train operation on inclines and declines. This practice is crucial for ensuring safety and stability in challenging weather conditions.