The Singapore Civil Defence Force (SCDF) said it was alerted to the incident at 8.33am.
According to Channel NewsAsia, a signaling fault caused delays on the Circle Line, which made trains congested and huge crowds seen at an interchange station.
The Straits Times has reached out to SMRT for comment.
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The trip, however, comes amid global concerns over North Korea's nuclear weapons programme and missile tests. The last time China's special envoy for North Korea visited the country was in February a year ago .
In a Facebook post, SMRT said that "23 passengers and 2 SMRT staff sustained light to moderate injuries, and have been conveyed to Ng Teng Fong Hospital and National University Hospital".
The first train collision occurred August 5, 1993, when an east-bound train stopped longer than scheduled at a station due to a technical fault and was then hit by another train, according to the National Library Board's resources. - Picture by Low Youjin/TODAY SINGAPORE, Nov 15 - Twenty-three passengers sustained minor injuries and had to be taken to nearby hospitals after a collision between two trains at Joo Koon MRT station this morning.
SMRT was recently troubled by a tunnel flooding incident happened in October. The train, which comprised six carriages, had a full capacity of 1,800 passengers, 156 of whom were injured during the peak-hour collision. It said that the "majority sustained minor injuries". According to Mei, she and her fellow passengers fell on their backs as a result of the collision.
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Mr Keating told the MPs that Honda would take 18 months to get its systems ready for new customs procedures for exporting to Europe.
She also posted a close-up shot of parts of the trains that collided, but we can't discern any noticeable damage.
Following the findings, SMRT revised its operating procedures to require staff to inspect the platform tracks for oil, and in the event of an oil spill, the train at the station preceding the spill will not move off until the train ahead has left the station.
Corte autoriza parte de prohibición de viajes de Trump
Los viajeros deberán demostrar relaciones familiares y otros contactos "formales" y "documentados" con instituciones como agencias o universidades.