Present there on invitation were officials, workers, scientists, technicians, teachers and researchers of the complex and other relevant sectors.

Pak Pong Ju, Choe Thae Bok, O Su Yong, Ro Tu Chol, Jo Yon Jun and Vice-Premier Kim Tok Hun were on hand.

Pak Pong Ju, member of the Political Bureau of the Central Committee of the Workers' Party of Korea (WPK) and premier of the Cabinet, made a speech.

Authorized by Marshal Kim Jong Un, Pak warmly congratulated those on newly making a subway train with indigenous efforts and technology.

They proved in practice the nature of the heroic workers, hardcore force, and the just determination of the WPK to accelerate the building of an economic power by believing and relying on their revolutionary spirit of self-reliance, he said.

He called for making uninterrupted innovation and progress by giving fullest play to the inexhaustible strength of the heroic Kim Il Sung's and Kim Jong Il's working class to greet the 7th Congress of the WPK with fresh achievements.