To Stop trains: 💢💢💢💢💢 In trains, a sand container holds dry sand. When needed, the sand is released through a pipe and dropped onto the rail just in front of the driving wheels. This increases traction and helps prevent wheel slip during acceleration and wheel slide during braking. 💢💢💢💢💢 #പുതിയ അറിവുകൾ 😍 #ട്രെയിൻ #ശാസ്ത്രലോകം 😍😍