Hong Kong subway trains collide during signalling test

Two subway trains have collided during a new signal system test in Hong Kong.

The collision halted services and threatened travel disruption for millions of communities.

The incident occurred between the central and admiralty stations before the service was open to the public this morning.

The trains had no passengers on board, but both drivers were taken to hospital.

Rail officials warned that repairs were likely to take quite a long time.

Reports say an investigation into the incident is now underway.