SINGAPORE: Train services on the North-South Line (NSL) and a part of the East-West Line (EWL) were disrupted on Wednesday (Jun 28) due to a signalling fault on a new system being tested, transport operator SMRT and the Land Transport Authority (LTA) said.
It came a day after SMRT and the Land Transport Authority (LTA) warned that that there could be potential delays on both lines in the coming weeks as engineers perform "intensive performance checks" for a new signalling system beyond the June holiday period.
In a joint statement on SMRT's Facebook page, LTA and SMRT said that initial investigations point to failure in the radio communication network of the new Communication-Based Train Control (CBTC) system, which is currently undergoing intensive full day testing.
They added that the NSL signalling system is expected to take a few more months to fully stabilise.
SMRT first reported a signalling fault on the NSL at about 5.15pm, telling commuters to expect up to 30 minutes more travelling time.
Twenty minutes later, it said all train services on the NSL were halted. "We are fixing a signalling issue on the North-South Line (NSL) and have paused NSL train services for the moment," SMRT said in a Facebook post at about 5.37pm. "We expect that this will take about 30 minutes, after which we should resume NSL train services."
At 5.44pm SMRT said train services on the NSL were being restored progressively and that commuters could take an additional 15 minutes for their journey.
However at 6.08pm, SMRT reported that the signalling issue recurred and said commuters could see an extra half hour for their commute.
It was a full two hours later after the signalling fault was announced that SMRT that train services on the NSL had resumed fully. "We are sorry for the inconvenience caused," it said in a Facebook post.
Separately, services on the East-West Line between Joo Koon and Tuas Link stations were disrupted at 5.22pm due to a signalling fault and were only restored about 45 minutes later.
SMRT has explained that tests for the new signalling system must be conducted all day to "accumulate adequate testing hours" to ensure that any teething issues can be sorted out.