There was a 1.5hr service disruption between Yew Tee and Woodlands MRT stations earlier this afternoon, free bus bridging services were activated by SMRT to assist commuters. LTA will work with SMRT to investigate the incident, our preliminary assessment is that faults in cables supplying electricity to the traction power system had resulted in the disruption of service.  We regret the inconvenience caused to commuters who had to detrain as well as commuters who were inconvenienced during the service disruption.