Two MTR trains collided at Central station at 2.57am on Monday morning, leaving two drivers hospitalised. The incident occurred during a test run before the system opened.
Update: MTR may need another day to clear Central train crash, as answers sought over new signalling system

The injured drivers were sent to Queen Mary Hospital, police told HKFP. One suffered a leg injury, whilst the other felt unwell after inhaling smoke.

“Today there will not be train service between Central and Admiralty on the Tsuen Wan Line. We will be deploying many staff at Central station to help passengers,” a spokesperson for the MTR Corporation told HKFP.

Commuters have been advised to use the Island Line to change between Admiralty and Central.
Update: Signal system supplier confirms software issue after Central train crash, MTR Corp says

At a press conference, Operations Director Adi Lau said the crash happened during a test of the new signalling system.

The MTR will provide more updates at a press conference at noon.

The rare incident occurred five months after the MTR system ground to a halt for an entire morning over signalling problems.
Additional reporting: Jennifer Creery.