questionText: To ask the Secretary of State for Transport, which train operating company had the highest proportion of passenger services that were (a) cancelled because of rolling stock failures and (b) operated with fewer carriages than planned in the latest 12-month period for which data is available.
answerText: The Department for Transport has indicated that it will not be possible to answer this question within the usual time period. An answer is being prepared and will be provided as soon as it is available.
heading: Rolling Stock