Today marks the 21st anniversary of the Paddington train crash which killed 31 people.
A total of 31 people died and a further 220 injured when two trains collided almost head-on before 08:10 BST on October 5, 1999.
The subsequent inquiry found the Thames Trains service travelling from Paddington to Bedwyn in Wiltshire had gone through a red signal.
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It then crashed into the London-bound high-speed First Great Western train which had left Cheltenham Spa in Gloucestershire at 06:03.
The Thames driver, Michael Hodder, 31, and the other train driver, Brian Cooper, 52, were among those killed as the collision led to a fireball in which coach H was burnt out.