The 1Q23 08:00 Bristol Kingsland Road to Derby RTC Network Rail test train passes Kintbury on 20 March 2025, with 43257 leading and 43357 bringing up the rear. This was running 42 minutes early, and was moving quite slowly, as it was only a few minutes behind the 6Z52 07:04 Tytherington to Quainton Railhead stone train. This monthly HST working normally visits South Wales, before returning to Bristol, and then heading for Swindon, and then travelling north via the Cotswold Line. On this occasion it didn't go to South Wales, and after traversing the Berks & Hants line, went to Paddington, and then headed north via Banbury.