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
Delays, diversions and cancellations caused chaos to services on South West Trains which were hit by signal failures in south west London.
During the attack Ione Wells' head was smashed against the pavement, her attacked grabbed at her chest with such force that it tore her bra.
The 17-year-old pushed her to the ground and smashed her head against the pavement, before grabbing at her chest.