Singapore's Land Transport Authority (LTA) deputy chief executive (infrastructure and development) Chua Chong Kheng said that a faulty signalling system on the MRT East-West Line had inadvertently removed a software protection feature on the first of two trains which had came to a halt at the Joo Koon MRT station in Jurong East.
The incident might be a gruesome drawback of the newly-developed signaling system.
Of those injured, 25 were taken to the National University Hospital and Ng Teng Fong General Hospital (NTFGH) for treatment while the other four were walk-in patients at NTFGH. "At 8:20, the second train moved forward unexpectedly and hit the first train", according to SMRT in the Facebook page as quoted from Yahoo News Singapore.
Transport officials reportedly said a train hit a stationary faulty train at the elevated Joo Koon station in the far west of the city state during the morning rush hour.
Eyewitnesses stated that the passengers of the moving train, caught off-guard, fell suddenly as the two trains made a horrific contact.
SMRT and LTA have also stated that they stopped train services between Joo Koon and Tuas Link to facilitate investigations on Thursday as a precaution.
Passengers were thrown by the impact, with several suffering knocks, fractures and bruises.
Transport Minister Khaw Boon Wan said yesterday: "Although Thales is confident, I am disturbed by the finding that a critical safety software could be disabled by a defective trackside device".
At Ng Teng Fong General Hospital (NTFGH), there were five new walk-in cases.
"I hope they can solve this problem before the one month and bring (service) back onstream", he said.
SMRT Corp Ltd said that the second train abruptly moved and collided with the train in front of it. "The driver said on the speaker system that help was on the way", said Ong.
This means trains will not travel between Joo Koon and Gul Circle stations.
He said the injured man in his 30s was helped by three commuters, and put into a wheelchair was taken away on an ambulance.
Trains continued to run in both directions on the unaffected side of the station platform, with SMRT announcing that commuters should expect 10 minutes of extra travelling time between Joo Koon and Tuas Link stations.
However, its services for other routes were not affected.