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
The Purple Rain singer died in April 2016
Fewer than a quarter of commuters want fellow passengers to start conversations with them on the Tube.
The grazing is part of a wildlife scheme to help a flower meadow and the insects that rely on it