I found myself on a 2+3 today with the driver definitely enjoying themselves.
Here’s a quick video where I record the current speed by the pointing the camera to a mobile that shows the current speed of the train by using satellite navigation signals.
Castle Class HST 2+3 acceleration from stopped to 100MPH and back to stopped over 4 miles and 14 chains between Yatton station and Worle station.
The train details are:
Castle Class HST
2C87 1800 Cardiff Central to Plymouth
Formed as 2+3
Front power car: 43022
Rear power car: 43154
Coaches 48110, 48111 and 49104
All coaches have power operated sliding doors for the passenger accommodation.
Video taken between Yatton station and Worle station. RTT gives the distance as 4m 14ch.
WTT ...... RTT
19:14 .... 19:14½ ... Dep Yatton
19:18½ ..19:19 ...... Arr Worle
Note the accuracy of the above timings is affected by the way they are generated. So treat them as appropriate values.