The Pyongyang Railway Bureau has solved technical problems arising in recycling various kinds of bearings by enhancing the role of members of the April 15 Technical Innovation Shock Brigade, and introduced scores of research successes including the manufacture of equipment for processing iron bars necessary for producing concrete sleepers.

Technologists and workers of the Chongjin Service Brigade of Engine have achieved successes in the work for ensuring the train service by manufacturing and installing a no-load breaker of AC welder. Those of the Kaechon Service Brigade of Engine and the Manpho Service Brigade of Engine have solved scientific and technological problems arising in major resistor insulation of locomotive engine.

The Kim Jong Thae Electric Locomotive Complex has set up the process of recycling railway carriage plates and ornamental glass frame, and several units have made contributions to the development of railway transport through vigorous campaigns for new inventions.