37612 accelerates through Ascott-under-Wychwood station on 13 July 2023, as it pulls away from a signal check with the 1Z23 06:45 Bristol Kingsland Road to Derby RTC Network Rail test train. 37610 is bringing up the rear. This had left Bristol 34 minutes behind time, and by the time it left Swindon it was over an hour late. The timings are so easy that it was almost back on time at Oxford.