37688 Great Rocks passes Wolvercote on 23 November 2022 with the 5Z30 08:58 Crewe to Reading Traincare Depot ECS, conveying barrier vehicles 6394 & 6393. This would pick up another two barrier vehicles at Reading, and then continue westwards as the 5Z31 13:47 Reading Traincare Depot to Exeter Riverside New Yard.