Question to the Department for Transport:

To ask the Secretary of State for Transport, what recent estimate she has made of the total cost of the electrification of the remainder of the South Wales mainline.

No recent cost estimates have been made by Network Rail for electrification of the South Wales Mainline, with the last available information dating from 2017. With bi-mode trains offering comparable journey times regardless of whether operating in diesel or electric mode, it is expected that any business case for electrification of this route would be very weak.