SINGAPORE: Following a second round of system checks on Wednesday night (Jul 8), authorities have yet to identify the root cause of the power fault that crippled the entire North-South and East-West MRT lines for 3.5 hours on Tuesday.
A statement from the Land Transport Authority (LTA) on Thursday said the authority said it will engage an independent consultant who specialises in transit power systems, to look into the overall conditional assessment of the entire power supply infrastructure and other railway trackside installations.
This assessment may start as soon as this month, it said. In the meantime, LTA and transport operator SMRT which runs the affected MRT lines, will continue with checks on the system.
They already conducted insulation testing between the cables and third rail, to ensure that the test components of the power supply equipment are in good working order. They also installed data loggers monitoring the running rail voltage at specific points on the lines, which experienced power trips on Tuesday.
The scale of Tuesday night's disruption was unprecedented, as the MRT's two main lines ground to a halt at the same time, during the evening rush hour. Approximately 250,000 commuters were affected.
SMRT had said its Operation Control Centre detected "multiple power trips" on the two lines an hour before service was suspended for safety reasons.