This means that railway departments should oppose "three violations", that is, "illegal construction, illegal operation and illegal behavior", and at the same time adhere to the "three railways" standards, that is, "railway standards, railway quality and railway safety". This is the slogan and requirement put forward by the railway department to ensure the safety of railway transportation and improve the quality of service. Among them, "railway standard" refers to the construction and operation in accordance with the standards of the state and railway departments; "Railway quality" refers to ensuring the quality of railway facilities and services; "Railway safety" refers to ensuring the safety of railway transportation. Opposing "three violations" means avoiding safety accidents and quality problems caused by illegal construction, illegal operation and illegal behavior.