It really must be April. They're going to take a train-load of passengers and dump them at the unroofed north end of the platform in driving rain? I think not.
Bearing in mind the vast majority of terminating arrivals don't have any other trains close behind anyway
XC▸ services generally follow the terminsting turbos, which are generally a few (at least!) minutes late, and the XC almost always waiting at the Home signal for the down platform
.
Cotswold Line services follow very closely behind - all the more so when terminating slow trains amble in three or four minutes behind time, followed by the pantomime I describe below in terms of despatching empty Turbos.
Sorry Chris, but as someone who day after day sees what goes on, a terminating slow service arriving ahead of a delayed XC service is a rare occurrence - perhaps they arrange it just for you - and if this does happen, the Oxford signallers often use the bi-directional signalling to put the terminating service into platform 1 to get it out of the way, unless that will mess up a southbound XC.
The trains that get delayed, day after day, are the Cotswold Line services, which are booked to follow the stoppers from Didcot. The Cotswold trains are what get stuck outside the station while the ludicrously slow process of despatching an empty Turbo goes on. The 18.17 and 18.54 departures from Oxford (and the 19.23 due to a silly bunching of trains just ahead of it) often fall victim to delays in this way - on Friday the 18.17 lost five minutes at Oxford because the 18.13 arrival from Paddington (I assume the working timetable actually allows more of a margin than the public timetable's four-minute gap), running just ahead of it, was late.
For many years, the dispatchers used to stand at the south end of platform 2 then walk through a Turbo to the front, checking it was empty. Recently, they have instead started boarding next to the footbridge steps, walking though to the back of the trains, then walking up the platform, locking the doors with the buttons on the coach ends, before reaching the front of the train and finally telling the driver he can go into the sidings. And the signallers don't always assist matters here, with the shunting signal for the move to the sidings sometimes not being cleared until after the dispatchers have completed their time-consuming routine.
If they really want to get empty trains out of the platform fast, these are the places they should be looking at to make changes, not silly notions that do nothing to assist Cotswold Line
HSTs▸ that will still be stuck at the signal south of Botley Road, because they are too long to fit on the platform behind a Turbo.
Of course, this was not much of an issue, at least for Cotswold trains, until a couple of years ago when the timetable was rejigged to put the stoppers out of Didcot ahead of the
FGW▸ fasts. Who came up with that clever wheeze?
As for assisting XC, they have got a cheek, considering how often their trains arrive late, messing up FGW services, or the XC trains that have a timing allowance, eating up platform time at Oxford, even though their journey only started at Reading.