A technical officer died from severe injuries sustained in an accident at Bishan Depot on Monday morning (March 23), SMRT said in a media release.
Muhammad Afiq bin Senawi, 30, was operating a hydraulic press machine in a Rolling Stock workshop when he got injured.
He received immediate first aid and was subsequently taken to hospital where he died at 11.20am.
"We have conveyed our deepest condolences to his family and are rendering support and assistance at this very difficult time," said Mr Neo Kian Hong, SMRT Corporation's Group Chief Executive Officer.
The public transport operator is assisting the Land Transport Authority, the Ministry of Manpower, and the police with the investigations.
SMRT has also called a safety time-out and suspended all similar maintenance works while investigations are ongoing.
Meanwhile, the National Transport Workers' Union said in a Facebook post: "Safety at the workplace is of paramount importance to our workers.
"The union will be working closely with SMRT and the relevant agencies to investigate what happened, and to review the current safety measures and safety protocols in place at the train depot."