Why are the girls in the railway police not worth the night shift?

The girls in the railway police work at night. The policewoman in railway police Police Station is divided into two posts: duty and daily service. The policewoman on duty at the station works in shifts, is responsible for maintaining the order of the station, and must be on the night shift. Female police officers who work daily go to work on weekdays and are responsible for the administration, party building, legal system, enterprise management and other work in their respective jurisdictions. They don't have to work at night, except for a few police stations with tight police force.