Running 14 minutes late, 37612 passes Uffington on 26 January 2023 with the 1Z23 06:45 Bristol Kingsland Road to Derby RTC Network Rail test train. 37610 is bringing up the rear. The train comprises: Mk1 generator van 6264, Mk2 Plain Line Pattern Recognition Coach 5981, Mk2 Overhead Line Inspection Coach 977983 & Mk2 Radio Survey Coach 977868.