Question to the Department for Transport:

To ask the Secretary of State for Transport, pursuant to the Answer of 26 January 2023 to Question 129878, if he will estimate the length of track in kilometres on which trains could travel at 140 miles per hour broken down by rolling stock performance specification.

Network Rail have yet to conduct that level of performance analysis. In line with normal project development, this work will be carried out to support the business cases required for the investment needed to implement the higher line speeds.