They succeeded in manufacturing a substitute converter for the existing subway train's dynamotor.

And they finished the technical designing for 10-odd projects at the Kim Jong Thae Electric Locomotive Complex while settling the technical problems for its modernization.

Meanwhile, such programs helpful to updating the railway administration were developed as a system for video meeting on railway transport control.

Those scientists also made a progress in applying prestressed reinforced concrete sleeper and normalizing the production of plastic brake slipper for wagons and improving its quality.