In the worst rail accident for nearly 40 years, three trains were involved in a collision in north London.

The crash took place during the morning rush hour at Harrow and Wealdstone station.

A London-bound express train travelling at speed from Perth in Scotland passed a red signal in fog and ploughed into the back of a commuter train from Tring in Hertfordshire.

Seconds later an express from Euston, heading to Liverpool and Manchester, crashed into the wreckage.

Damage to the carriages and steam engines was considerable, and a total of 108 passengers and four rail crew were killed with nearly 350 people injured.

It was the UK's worst rail accident since 1915, when 227 people died when a passenger train collided with a train carrying troops at Qunitinshill in Scotland.