June 01, 2017, 07:20 PM 
On Thursday's evening peak rush hour, SMRT's North South Line is experiencing a big-time delay, with commuters reporting being turned away from the station and calls for police officers' assistance being made over station intercom.
Here's a video of the scene at City Hall MRT station, for instance:
HAHA I thought got gss happening at cityhall pic.twitter.com/2YoCbWgp0g
— Calebbbb! (@caleblohCL) June 1, 2017
As well as this even more fearsome-looking scene at Jurong East:
lol thanks waited for 30plus mins and then last min tell platform no service lol smrt pic.twitter.com/Ne7HbHliMw
— fi (@FaadehlehHakehm) June 1, 2017
Over at Bishan MRT station, people were stranded inside the paid section of the train platform as they were barred from crossing over from the Circle to the North South Line:
Photo by and courtesy of Merrill Tang
As it turns out, this is happening because of "new signalling system checks":
[NSL] Due to new signalling system checks, pls add 20mins travel time between #MarinaSouthPier & #JurongEast both bounds. We are sorry.
— SMRT Corporation (@SMRT_Singapore) June 1, 2017
And as usual, many are disputing the claim that the additional travel time is 20 minutes:
Fk la, 20 mins my ass, been waiting 30 mins between khatib and amk ?
— Nicholas Ling (@Fiery274) June 1, 2017
It is not 20 mins... more like an hour
— hssg77 (@hssg77) June 1, 2017
Meanwhile, SMRT says the additional travel time has been cut to 15 minutes:
[NSL]UPDATE:Trains are progressively returning to normal speed.Pls expect 15mins additional travel time btwn #MarinaSouthPier & #JurongEast.
— SMRT Corporation (@SMRT_Singapore) June 1, 2017
And that it's offering free bus services between Jurong East and Choa Chu Kang, as well as City Hall and Ang Mo Kio — even though, well, its entire line is affected:
[NSL] UPDATE: Free regular bus services are available between #JurongEast and #ChoaChuKang, also #CityHall and #AngMoKio.
— SMRT Corporation (@SMRT_Singapore) June 1, 2017
But the topmost question on people's minds is:
Why would you be doing checks during peak hours? @SMRT_Singapore
— sylxlviic (@sylvchin) June 1, 2017
We're also very keen to know, SMRT.
Top photo by Grace Huan
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