地铁南北线的油池站发生信号故障，蔡厝港和兀兰之间的列车服务将延长30分钟。
SMRT在推特贴文指出，当局已在受影响的地铁站提供免费巴士服务。
[NSL]: Due to a signalling fault at Yew Tee station, train services btwn #ChoaChuKang and #Woodlands will be delay for about 30 mins. Free regular bus service is available between #Choa Chu Kang and #Woodlands.
— SMRT Corporation (@SMRT_Singapore) December 25, 2017