§ Mr. CohenTo ask the Secretary of State for the Environment, Transport and the Regions, pursuant to his answer to the hon. Member for Carshalton and Wallington (Mr. Brake) of 21 December 1999,Official Report, column 523W, on London Underground, if he will list the principal causes of the failures of rolling stock, indicating the number of failures in each category. [111593]
§ Mr. HillThis is an operational matter for London Underground. To provide the principal causes of the failures of rolling stock, indicating the number of failures in each category would incur disproportionate cost.