If you use assistive technology (such as a screen reader) and need a
version of this document in a more accessible format, please email firstname.lastname@example.org.
Please tell us what format you need. It will help us if you say what assistive technology you use.
This letter, sent to Angel Trains Ltd, is about a modification to a Class 317 train unit and compliance with technical specifications. It confirms that authorisation under the Railways (Interoperability) Regulations 2011 is not required for the project.