Train hits truck that slid onto track near a tunnel in Taiwan, killing 51

A train has barrelled into an unmanned truck that rolled onto the track in Taiwan.

The National Fire Service said at least 51 people were killed and dozens injured in the island's deadliest rail disaster.

Many passengers were crushed, while some survivors were forced to climb out of windows and walk along the train's roof to safety.

The government's disaster relief centre said the truck's emergency brake was not properly engaged and the vehicle slid down a hillside.

A Railways Administration official said the train's lead car then crashed into the truck.

The crash occurred Friday, the first day of a long holiday weekend when many were hopping trains on Taiwan's extensive rail system.

The train was carrying more than 400 people.