Commuters queueing to collect fare refunds and excuse slips yesterday, after an ''intermittent signal fault'' interrupted travel on the Circle Line, affecting thousands of commuters during the morning crush.

At one point, service ground to a halt for over an hour in the northern stretch of the line, affecting five stations between Botanic Gardens and Serangoon.

On other parts, journeys were delayed by 20 to 30 minutes up to past 10am.

SMRT said preliminary findings revealed a communications glitch similar to the one that disrupted service on the line for a week in late August.

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