A propelling control vehicle (PCV) is a type of British railway carriage for carrying mail.

Similar BR Class 91 driving van trailer (DVT) used on the ECML differ by being fully equipped for high-speed train control.

The rebuilding work including removal of the windows and slam-doors, the fitting of roller shutter doors, and modernisation of the cab.

At the same time these vehicles were converted, the Class 47/7 locomotives that hauled mail trains were modified to be able to work in push-pull mode with the PCVs.

PCVs were also used on travelling post office trains from London to Plymouth, Newcastle, Norwich, Carlisle and Glasgow.