5th December 2023 At the time of this image the oldest operational HST powercar in the UK No. 43004 'Caerphilly Castle' is pictured at Taunton on the 5th December 2023. No. 43005 'St. Michael's Mount' and No. 43156 'Maen Castle' arrive into Taunton while operating 2C89 19:00 Cardiff Central - Plymouth during the last week of operation of Castle HST sets north of Exeter. (Photo: Brian Garrett)