It’s an emergency timetable on the Bedwyn route related to the small pandemic we have going on out there.
It see Reading to Newbury shuttles and Paddington to Bedwyns merged into a Reading to Bedwyn shuttle, as the service doesn’t reach London where the 80x are based using Reading based turbos is more logical.
Also means they don’t have to run with a guard which reduces staffing demand at a time where rail companies are suffering significantly higher sickness rates