Accompanying him were Choe Ryong Hae, Pak Pong Ju, Ri Su Yong, Kim Yong Chol, Pak Thae Song, Ri Yong Ho, No Kwang Chol and other senior officials and technical officials.

He visited the center together with Wang Huning, member of the Standing Committee of the Political Bureau of the Central Committee of the Communist Party of China (CPC) and member of the CPC Central Committee Secretariat, Cai Qi, member of the Political Bureau of the C.C., CPC and secretary of the Beijing Municipal Committee of the CPC, Song Tao, head of the International Liaison Department of the C.C., CPC, Chen Jining, mayor of Beijing Municipality, and Li Jinjun, Chinese ambassador to the DPRK.

The director of the centre explained to Kim Jong Un, the respected Supreme Leader of the party, state and army of the DPRK, in detail about the centre that has made its development under the deep care of the Chinese party and government leaders.

Carefully hearing the director's explanation, Kim Jong Un went round the Beijing Municipal subway construction history exhibition, the subway traffic control centre, the automatic ticket sale and ticket check system monitor centre to learn in detail about operation of the Beijing Municipal subway and its development prospect.

Saying that he admires at the high-level automation and good combined control system of the centre, he hoped that the centre would further develop into a world-level traffic control centre and make a greater progress.