In 1937, railway engineer Cheng Huaixin and telegraph operator Su Ling met for the first time at the North Station. The bell conveyed messages and the codebook concealed their feelings. However, they were hastily separated due to the war, and they fell into a 13-year-long misunderstanding.
During the war years, he traveled to the south and rushed to repair the railway in Yunnan and Burma. She rushed to the northwest and southwest to deliver telegrams. The bell was damaged, the drawings were lost, and the messages were interrupted. They passed by each other countless times, and she only relied on the railway symbols and telegraph code books to stick to her heart. Drifting after the war, the two followed the clues of railway tracks and old objects, approaching and missing each other again and again, but never changed their minds about each other.
At the Chengdu-Chongqing Railway construction site in 1950, the familiar copper bell penetrated the hustle and bustle of the work shed. The moment our eyes met, all time and space barriers suddenly disappeared. The railway track paved the road between home and country, and also led the two people on their way home. The two tracks finally merged into one, and they finally reunited after a long separation.
