I was returning from Kolkata with my family by train. Our train had stopped at a station and my father had gone to bring some snacks for all of us. Suddenly the train started moving. My mother became worried as my father had not returned when we heard someone shouting loudly to pull the chain. My mother tried to pull the chain but couldn't as it was very tight. A man came forward and helped my mother.The train stopped and a little girl quickly jumped out of the train. Then we came to know that actually, that girl had boarded the wrong train by mistake and couldn't get down as the train had started moving suddenly. Her parents were also terrified and had shouted to pull the chain. At that time my father also arrived with the snacks he told us that if the chain would not have been pulled then he couldn't have boarded the. We thanked our lucky stars!