Can the People's Public Security University of China only go to the railway to find a job as a railway policeman?

That's right. Official website of the People's Public Security University of China shows that public security majors facing railway police authorities, customs anti-smuggling public security organs, State Immigration Bureau, civil aviation public security organs and shipping public security organs can only choose the corresponding public security organs to take the public security joint entrance examination when they graduate, which means that railways can only go to railways.