How many years did the three express trains operate?

[VanJulian]

Three express trains operated for 48 years. The origin of the three express trains: The three express trains, originating from Shanghai, Zhengzhou, and Wuhan respectively, were loaded daily with fresh goods for Hong Kong, including live livestock, poultry, and fresh fruits and vegetables, which were transported to Hong Kong via Shenzhen. Because they operated "regularly, on schedule, and on fixed routes" with three trips per day, they were commonly referred to as the "three express trains." Detailed introduction to the three express trains: Over more than forty years, the three express trains passing through the Sungang Customs amounted to over 41,100 trips and more than 36,200 carriages. They transported over 98 million live pigs, more than 5.8 million live cattle, over 7.95 million tons of frozen meat, billions of live poultry such as chickens, ducks, and geese, as well as countless fruits, vegetables, live fish, aquatic products, dried goods, etc.