Bennett, a train driver born in Shapwick, was Great Britain's first track and field gold medal winner.
Mr Buchanan, a train driver, said although he did not know Mr Griffiths as a friend he had bumped into him a few weeks ago in a local pet shop.
Staff spotted two broken parts near Old Street Station, east London, on 8 March after a passenger train driver reported water pouring on to the train's roof.
Mr Ash, a retired professional train driver with more than 50 years' experience, said it was possible he did not lock a reversing lever into place, which could have allowed the locomotive to slip between forward and reverse.
Drivers departing from the company have to give three months' notice, yet on average it takes about 12 months to train a new driver.
The broken sections were spotted by a manager and a driver onboard an empty train sent to inspect the site.
This system, Positive Train Control (PTC), is intended to stop or slow a train automatically if a driver goes too fast or passes a red signal.
Every train must have a driver to ensure the safe and effective running of the Underground.
And a British Transport Police spokesman said a branch of a tree which had fallen onto the rail line near New Cumnock, Ayrshire, shattered the windscreen a freight train, showering the driver with glass.
If a careless driver jumps a red light, the brakes come on and the train halts.
In order to train for her job as a test driver for the Formula One team Marussia, Maria de Villota puts on a weighted helmet and does a couple hundred head rolls.
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The driver of the train, Iain Black, suffered a broken collar bone and a broken bone in his neck, his union Aslef has said.
In North Yorkshire, a driver escaped uninjured after his car was hit by a train when it skidded on snow and onto rail tracks at a level crossing near Selby.
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What is noticeable straight away is that where the driver should sit there are passengers - it is a driverless train and the trains are very, very regular.
Changes to train timetables and work patterns have been introduced to reduce cancellations caused by a driver shortage, according to London Midland.
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And animals still periodically blockade the track, leaving the driver little choice but to stop the train, get out and chase them off with a big stick.
But Mr Darling said such a system still might not have averted the crash as the driver might not have been able to stop the train in time, even if he had been alerted to the car on the crossing.
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