Network Rail's Ultra-Sonic Test Unit 901001 (977391 + 999602 + 977392) failed at Exeter before working that evenings over night test run. 31459 was sent down to assist 901001. With the loco on the front, the route was shortened and the headcode of the service was 4Z08 20:28 Exeter St Davids to Exeter St Davids via Totnes. In torrential rain at 22:28, 901001 stands in Platform 2 whilst 31459 runs round. Wednesday 22nd November 2006.