MPs today hit out at London mayor Sadiq Khan for not upgrading trains on the Piccadilly line, which have been unable to run on time due to autumnal leaf-fall.
Speaking in the House of Commons, John Hayes, minister at the Department for Transport said the mayor "must do much better".
There have been frequent delays on the Piccadilly line, which Transport for London has said are due to leaves on the track on parts of the line which are overground. A spokesperson for the mayor said an action plan was in place to deal with the problem.
"This includes introducing two specialist engineering trains that are designed to improve rail adhesion, and carrying out a significant trackside vegetation clearance programme. TfL are taking action to learn lessons from the past and prevent any disruption this winter," the spokesperson said.
Rupa Huq, Labour MP for Ealing Central and Acton said: "Whether it is the 1974 Piccadilly line trains - almost as old as me - or the even less reliable 1992 Central line ones, autumnal leaf-fall at the moment is causing havoc for the above-ground sections of the tube in suburban locations."
She asked the minister when the "old workhorses" would be disposed of and replaced.
Hayes said: "I can sense, and you probably can too Mr Speaker, a clamour, and that clamour is coming from across the House.
"The rallying cry issued is that the mayor must do more and must do better and it seems the honourable lady joins my calls."