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고양옥(Ko Yang-Ok),김상엽(Kim Sang Yeop),이남일(Lee Nang Il),정호형(Jung ho Hung) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Derail accident of train and motorcar through signal override causes such a huge obstruction in train service. To minimize such derail accidents, number of bills were examined such as installing normal and reverse position indicator on the switch. A indicator was necessary which does not affect current equipments and not to be confused as traffic lights. Normal and reverse position indicator is installed in the middle of the rail in front of front rod of switch. It is to prevent derail accident while manual handling of obstacle by ease of verifying normal and reverse position by attendants or motorcar driver. Also, it is a device that prevents accidents by indicating normal and reverse position of switch during night service of motorcar. Such a prevention accomplished through thorough maintenancework of equipment, precise handling of operators and exterior factors are eliminated or perceived and treated well.