The prevention of sub-events which have higher cluster coefficient, do not help in the SEIN prevention. But prevention of sub-events with higher output-degree, betweenness would have significant effect in SEIN prevention. An efficient way to prevention or reducing the adverse effects of hazard sub-events is to change escalator etiquette of WLSR into “standing one person per step and alternately left and right”. These findings suggest that “standing one person per step and alternately left and right” rather than escalator etiquette of WLSR would be significantly reducing escalator incident in MRT stations.