From http://news.bbc.co.uk/1/hi/england/london/4397136.stm
Victoria Line Tube trains are being inspected after one travelled between stations with the doors open.
Metronet, which is responsible for maintenance on the line, said it believed the incident last month was probably caused by a passenger.
A spokesman said 40% of the fleet had been checked and nothing had been found to give "cause for any concern".
The Rail, Maritime and Transport union demanded safety assurances and blamed the problem on "shoddy modifications".
RMT General secretary Bob Crow said that work carried out by "unqualified agency staff has led to another safety crisis on the Tube network.
"If the doors of a peak-time Victoria Line train jam, the results could be lethal for the travelling public."
Metronet said the union's claims were "groundless".
The work, which Metronet said was precautionary, is due to be completed by 7 November.
Victoria Line Tube trains are being inspected after one travelled between stations with the doors open.
Metronet, which is responsible for maintenance on the line, said it believed the incident last month was probably caused by a passenger.
A spokesman said 40% of the fleet had been checked and nothing had been found to give "cause for any concern".
The Rail, Maritime and Transport union demanded safety assurances and blamed the problem on "shoddy modifications".
RMT General secretary Bob Crow said that work carried out by "unqualified agency staff has led to another safety crisis on the Tube network.
"If the doors of a peak-time Victoria Line train jam, the results could be lethal for the travelling public."
Metronet said the union's claims were "groundless".
The work, which Metronet said was precautionary, is due to be completed by 7 November.