Two subway trains collided during a new signal system test in Hong Kong on Monday, halting services and threatening travel disruption for millions of commuters.
The incident occurred between the Central and Admiralty stations before the service was open to the public on Monday morning, reports the BBC.
While the trains had no passengers on board, both drivers were hospitalised.
Rail officials warned that repairs were likely to take "quite a long time".
Network operator Mass Transit Railway (MTR) said sections of the Tsuen Wan Line had been suspended and urged commuters to avoid the affected route and to use other forms of transport if possible.
An investigation into the incident was underway.
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