When it comes to relay stations, we know that horses are important means of transportation, and their number determines the size and function of the station. Generally, relay stations have 60-80 horses, and Yucheng Post Station has more than 130 horses. Due to different levels of urgency in sending documents, the speed chosen will vary accordingly. It can be 300 miles per day and night, 400 miles per day and night, and up to 800 miles per day and night. The book records the good news of flying 800 miles to 600 miles per day, which means that the horses at the relay station are divided into strong horses, medium horses, and thin horses. Speaking of speed, Yang Guifei's lychee back then can illustrate that when she rode on the Red Dust Concubine, no one knew it was lychee. Fresh from the South; The lychee was particularly fresh when it was delivered to the Noble Consort, and the speed was so fast. However, her lychee had never entered our area before. Secondly, in order to ensure the freshness of the lychee and to show his love for the beauty, Emperor Ming of Tang set up a dedicated line for her, specifically delivering lychee and not anything else. This is similar to our current express service, a green channel. This is a drinking water dock from the Ming Dynasty, where hundreds of horses could play and drink water at the same time.
