Latest Singapore News

Circle Line breakdowns likely caused by train carriage 46's signalling faults

After several weeks of investigations, a joint team (we) comprising the Land Transport Authority (LTA), SMRT, the signalling system manufacturer Alstom, the Infocomm Media Development Authority (IMDA), the Defence Science & Technology Agency (DSTA), DSO National Laboratories, the Government Technology Agency of Singapore (GovTech) and electro-magnetic interference specialist Rohde & Schwarz, has traced the source of the signalling problems on the Circle Line (CCL) to an intermittent failure of the signalling hardware on one train, Passenger Vehicle 46 (PV46).
 
The loss of communications on the trains close to PV46 and its intermittent signalling failures resulted in their emergency brakes being automatically activated, as a safety feature. Ongoing investigations indicate a strong likelihood that intermittent hardware failure on PV46 was also the cause for the about 200 occurrences of loss of signalling communications on CCL trains between 28 August and 2 September 2016.
 
circle line breakdown caused by faulty carriage pic1
 
Investigation Findings
 
An initial hypothesis was that interference from telecommunications signals may have caused the repeated activation of the trains’ emergency brakes. To test this, LTA, together with IMDA and the mobile network operators, suspended mobile telecom services across the entire CCL for two hours in the evening of 3 November 2016, and then for a full day on 4 November 2016. These tests showed that telecommunications signals were not the source of the interference.
 
Meanwhile, engineers and data scientists from DSTA and GovTech studied data collected from train logs and incident reports, and found that almost all of the faults occurred in the proximity of one particular train, PV46. On Sunday, 6 November 2016, we tested if PV46 was the source of the problem by running the train during revenue hours.
 
We found that PV46 indeed caused a loss of communications between nearby trains and the trackside signalling system, resulting in the activation of emergency brakes on these trains. Before PV46 was put into service on that day, no loss of communications was observed on any CCL train.   
 
Further tests on PV46 by engineers from LTA, DSTA and Rohde & Schwarz showed that faulty train signalling hardware on PV46 was emitting erroneous signals in addition to the ones it was supposed to emit. These erroneous signals occasionally prevented trains travelling in the vicinity of PV46, including in the opposite direction, from properly communicating with the trackside signalling system. This loss of communications led to the activation of the trains’ emergency brakes.
 
PV46 has been deployed for service since July 2015. Before being put into service, the train was tested extensively both at the manufacturing location as well as under local conditions. It is unclear at this point why the train’s signalling hardware has been experiencing intermittent failure. So far, no other train has been found to have the same hardware issue, but we continue to monitor the situation closely.
 
PV46 has been pulled out of service while LTA and SMRT continue to work with Alstom on further investigations and rectification of its faulty hardware. LTA and SMRT will also conduct a thorough examination of the signalling hardware for the rest of the CCL fleet.
 
Mr Chew Men Leong, Chief Executive (LTA), said, “Following our earlier assessment that the signalling faults on the Circle Line were caused by an interfering signal, the joint team spent many weeks trying to trace the source. The sporadic occurrence of the incidents at different points along the Circle Line made it challenging for the investigators and I thank commuters for their patience during this period.
 
I am also grateful for the collaboration with the other Government agencies and the cooperation from the telcos in helping us nail down the problem. In particular, I thank the engineers and data scientists from DSTA and GovTech respectively, without whom we would not have been able to theorise the possibility of a faulty train, and identify PV46.”
 
Credits: LTA, SMRT
 

Add comment

Emails are optional and for tracking replies. Names are unique; get yours today with a comment!


Security code
Refresh

La Daily

First South Korean President to visit Singapore in 20 years
First South Korean President to visit Singapore in 20 years

  South Korean President Moon Jae-in kicked off his first full day in Singapor [ ... ]

Read more la
Muslims across the world celebrate the end of Ramadan
Muslims across the world celebrate the end of Ramadan

  Muslims across the world have gathered together to celebrate the end of Rama [ ... ]

Read more la
Kim-Trump summit day finally arrives
Kim-Trump summit day finally arrives

  Thanks for joining us on our special coverage of the historic summit between [ ... ]

Read more la
President Trump at Shangri-La; Kim Jong-un at St Regis? TrumpKim Summit 2018
President Trump at Shangri-La; Kim Jong-un at St Regis? TrumpKim Summit 2018

  With the venue for the historic summit confirmed as the Capella Hotel on Singa [ ... ]

Read more la
Trump-Kim Summit 2018 set at Capella Hotel, Sentosa
Trump-Kim Summit 2018 set at Capella Hotel, Sentosa

  US President Donald Trump and North Korean leader Kim Jong-un will meet at a [ ... ]

Read more la
Singapore hosting first-ever N. Korea-U.S. summit -- why Singapore?
Singapore hosting first-ever N. Korea-U.S. summit -- why Singapore?

  From Switzerland to the inter-Korean border village of Panmunjom... there we [ ... ]

Read more la
Malaysian Opposition beats BN in general election - a first in 60 years
Malaysian Opposition beats BN in general election - a first in 60 years

  Malaysia's former ruler and opposition leader Mahathir Mohamad has returned to [ ... ]

Read more la
N. Korea-U.S. summit likely to be held in Singapore in June
N. Korea-U.S. summit likely to be held in Singapore in June

  The date and location of the historic summit between North Korea and the Unite [ ... ]

Read more la
Singaporean robot builds Ikea chair in minutes
Singaporean robot builds Ikea chair in minutes

  Scientists in Singapore have developed a robot that could solve what can som [ ... ]

Read more la
Singapore's most expensive city in the world; Seoul ranks 6th
Singapore's most expensive city in the world; Seoul ranks 6th

  17 Mar 2018 - Seoul has been ranked the sixth most expensive city in the world [ ... ]

Read more la
Singapore & France launch Year of Innovation 2018
Singapore & France launch Year of Innovation 2018

Minister for Trade and Industry (Industry) S Iswaran hosted French Minister for Higher Education, Re [ ... ]

Read more la
Code of Practice for Safer Giving Online
Code of Practice for Safer Giving Online

23 January 2018 - Four major crowdfunding platforms in Singapore have committed to adopting an indus [ ... ]

Read more la
e-scooters not allowed on roads
e-scooters not allowed on roads

LTA to Roll Out Safe Riding Programme from 1 February 2018

The Land Transport Authority (LTA) is ste [ ... ]

Read more la
Asia Security Summit wraps up in Singapore
Asia Security Summit wraps up in Singapore

  One of Asia's biggest security conferences was held in Singapore.   Topping [ ... ]

Read more la

Our Sponsors



verychio.com-drag-and-drop-editor

La Latest

South Korea launches 5G; first in the world

  Just about a week ago, South Korea's three major mobile carriers launc [ ... ]

Read more la
France boosts security for new 'yellow vest' protests despite fuel tax reversal

  The political crisis engulfing French President Emmanuel Macron is showi [ ... ]

Read more la
Tiny polar bear cub acts cute

  Berlin Zoo released this adorable footage of a new-born polar bear cub snu [ ... ]

Read more la
Teenagers killed in nightclub stampede

  A stampede in an Italian nightclub killed six people in the early hours of Sat [ ... ]

Read more la
China demands release of Huawei CFO Meng Wanzhou

  China is demanding the release of Huawei's chief financial officer who has been  [ ... ]

Read more la
Match-pointer! Ball-dogs let loose on tennis court

  For the first time in UK tennis history, ball-dogs are stepping onto the c [ ... ]

Read more la
Google launches public self-driving taxi in Arizona

  Google's self-driving car business, Waymo, has launched its robotaxi service i [ ... ]

Read more la
Mobile bank Monzo raises £18 mil in three hours

  Mobile-only bank Monzo has hit its crowdfunding target after raising £18 mill [ ... ]

Read more la

La Entertain

The Clooneys host dinner for Prince Harry and Meghan

  George and Amal Clooney are preparing to host the Duke and Duchess of Sussex for [ ... ]

Read more la
Justin Bieber to settle lawsuit filed by ex-neighbours

  Pop star Justin Bieber has agreed to settle a long-standing lawsuit filed by an  [ ... ]

Read more la
BTS' first feature film "Burn the Stage: The Movie" hits cinemas worldwide

  Thrilling news for BTS fans. The first official movie of the K-pop sensations fi [ ... ]

Read more la
Jennifer Lopez wants your sexy vote for US midterm elections

  Oprah, Alicia Keys and Jennifer Lopez are just some of the celebrities to urge [ ... ]

Read more la
Spice Girls Reunite For 2019 UK Tour without Posh

  After teasing fans with a reunion for years, the Spice Girls are finally r [ ... ]

Read more la
Busan International Film Festival 2018

  The Busan International Film Festival is back for its 23rd edition in Korea' [ ... ]

Read more la
Fan Bingbing appears on planet earth again

  After vanishing for months,.... China's top actress Fan Bingbing has resurface [ ... ]

Read more la
BTS becomes first K-pop group to speak at UN General Assembly

  President Moon is not the only one representing South Korea at the UN Gene [ ... ]

Read more la