Mike Strzelecki from London Underground, said:
"Thiswas clearly a serious incident and London Underground and Tube Lines actedquickly to investigate its causes and take action to ensure that the risk ofsuch a rare incident recurring was minimised.
"Following the incident LU immediately put in placeprocedures to remove the engineering train and tow-bar from use on the railway.
"Since then LU and Tube Lines have put in place even tighterapprovals and controls for the design and use of all such equipment.
"LU staff's swift actions meant that this incident was drawn to a safe conclusion. London Underground has an excellent and improving safety record, with more than ten times fewer serious incidents on the Tube than in 2000. This has been achieved in part by ensuring that all significant incidents are investigated thoroughly and the root causes addressed.”
More top news
After the terror attacks, Londoners are starting to reclaim Westminster Bridge - proof already that life is returning to normal.
A man who met PC Keith Palmer said his murder "sent a shiver down my spine".
Officers were given the touching letter at Brixton Station while they were on a reassurance patrol after yesterday's attack