I checked this out knowing I almost certainly could find this timetable at the bottom of my briefcase - this service (which was a Culham not an Appleford stopper, I see) had a 2 minute stop at Didcot, whereas the previous two had 8 and 6 minute stops.
But then we're only passengers, and our reasonable needs do seem to get in the way of running the trains
How much would it cost to upgrade Turbos for this feature?