Question to the Department for Transport:

To ask the Secretary of State for Transport, what comparative assessment her Department has made of the reliability of battery (a) bi-mode, (b) tri-mode and (c) battery/electric hybrid trains and fully electric trains; and if she will publish the data underpinning this assessment.

The Secretary of State has not made an assessment of the merits of different types of traction as this is a matter for operators when procuring rolling stock to deliver passenger services. The Rail Delivery Group collects common reliability data from operators and a range of industry systems as part of their role in improving performance across the industry. This data is shared with operators and other industry partners to help with reliability improvements.