25 to 70 people. According to official website of Lanzhou Jiaotong University, as of July 25th, 2023, according to different majors, the number of students in a class of Lanzhou Jiaotong University is different, ranging from 25 to 70. The number of students in class 2 104 of transportation major is 6 1, and the number of students in class 2202 of electronics major is 27. Lanzhou Jiaotong University is a university jointly established by China Railway Corporation, Gansu Provincial People's Government, State Railway Administration and Gansu Provincial People's Government.