1991 train wreck in the United Kingdom
On 7 December 1991, two trains collided inside the Severn Tunnel, between England and Wales. There were no fatalities but 185 passengers were injured.
Accident.
The 08:30 London Paddington to Cardiff Central operated by an InterCity 125 was stopped at a signal guarding the entrance to the Severn Tunnel. On telephoning the signalman according to Rule 55, the driver was advised of a signal failure and given permission to proceed slowly at caution. into the tunnel, the train was struck from behind by a Class 155 "Sprinter" travelling from Portsmouth to Cardiff. 185 passengers were injured, including five seriously, but none fatally.
Because track circuits were unreliable in the unusually wet tunnel environment ( of water are pumped out per day), axle counters were used instead. The official report into the accident could not reach a firm conclusion, but speculated that the cause was either:
References.
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