The Study of Railroad Signal control system for old line speed elevation

기존선 속도향상을 위한 철도신호시스템의 동향 연구

Much research for speed elevation of old first move of internal railroad is achieved. Also, several fees of foreign flag age of forty years improvement of a signal system and development accomplish. This treatise examines about. improvement and development. of consisting signal system in internal. Also, examine about development for technological reduced scale of internal relationship and research propulsion system. Wish to present direction accordingly.