Timeline of NSL disruption due to flooded MRT tunnel

Timeline of NSL disruption due to flooded MRT tunnel

Train services along the North-South Line (NSL) from Ang Mo Kio to Newton are still not available, said SMRT on Sunday (Oct 8). (Photo: Alan Sg)

SINGAPORE: A torrential downpour on Saturday (Oct 8) afternoon wreaked havoc on train services on the North-South Line (NSL), causing a section of the tunnel between Braddell and Bishan MRT stations to be flooded.

Service on half the NSL - from Ang Mo Kio to Marina South Pier – was halted for more than 3 hours.  Train services in both directions were suspended between Ang Mo Kio and Newton MRT stations for almost 20 hours before they resumed at 1.50pm on Sunday. 

Here’s a look at the timeline of events:

SATURDAY

5:33pm: Train services halted between Bishan and Toa Payoh MRT stations after a section of the tunnel between Bishan to Braddell MRT stations flooded following a heavy downpour.

5.36pm: SMRT tweets that “due to a track fault”, there is no train service from Bishan to Toa Payoh towards Marina South Pier.

It adds that this is not linked to a project to upgrade the signalling system along the NSL.

5.55pm: An SMRT train captain reports a small fire on the trackside in the tunnel between Marina Bay and Raffles Place MRT stations. SMRT later says the Singapore Civil Defence Force was activated within minutes to Marina Bay. However, the fire had died out by itself, SMRT says.

6.05pm: SMRT announces on Twitter that train services in both directions between 13 stations from Ang Mo Kio to Marina South Pier are suspended. For safety reasons, North-South Line train services between Ang Mo Kio and Marina South Pier are not available.

7.32pm: SMRT gives first confirmation that the NSL train services were disrupted due to “water in the tunnel from Bishan to Braddell MRT stations”.

9.22pm: Train services between Newton and Marina South Pier are restored.

10.45pm: SMRT says train services from Newton to Ang Mo Kio stations in both directions are not available till end of service on Saturday. It says engineers will carry out network-wide tunnel checks throughout the night.

SUNDAY

6.09am: Service between Newton and Ang Mo Kio stations still not restored. SMRT says it is striving to resume service at 9am.

8.32am: SMRT says work to clear water in the tunnels between Bishan and Braddell MRT stations is still in progress and the effort requires more time.

10.09am: The water between Braddell and Bishan MRT stations is “almost cleared” thanks to overnight efforts from teams from the SCDF, PUB, Land Transport Authority and SMRT.

1:52pm: SMRT announces that train services in both directions between Newton and Ang Mo Kio MRT stations resumed at 1:50pm.

Engineers will deploy several empty trains on the tracks between Newton and Ang Mo Kio for final safety checks before passenger services resume, SMRT says.

1.56pm: SCDF releases first photos of the flooded MRT tunnels and says the water was cleared from the tunnel at 11am. It received a call for assistance from SMRT at 7pm, it adds.


5.07pm: A water pumping system malfunction resulted in flooding between Bishan and Braddell stations, according to preliminary investigations by the Land Transport Authority. The pump system has since been repaired, it adds, and investigations are ongoing.

Source: CNA/mn

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