This is an act of restricting sales and a unilateral act of the station. According to the relevant regulations of the Ministry of Railways, this kind of behavior is not allowed. But the Ministry of Railways can only acquiesce in this kind of thing that exists in all stations. I'll teach you a trick. You go online to find a new railway passenger transport regulation. In fact, there are relevant regulations in this regard. Take it with you every time you buy a ticket. On one occasion, the conductor refused to sell it, saying that it was restricted, and said to her, without saying anything, she immediately made up the ticket! ! !