I am sure that this is quite possibly true (however appalling it is that it's not been accomplished yet (not for discussion here i feel however), however, the SO 5C11, 0712 Exeter New Yard - Exeter SD is listed as Diesel / 802 trailing loadGWR / NR have not yet finalised a complete set of sectional timings for all the various depot and yard moves, as the emphasis has been rightly focused on getting the main running times correct. Therefore for minor moves such as this, the legacy HST timings continue to be employed.
5C11 - SO http://www.realtimetrains.co.uk/train/Y96410/2019/12/21/advanced
Although, i shall say that the schedules are different, 5C11 merely shunts into Plt #3, which 5C50 SX 0649 Exeter New Yard - Exeter SD double shunts, via Plt #1 and Signal #664 to Plt #4, so i shan't say that the 802 SRT for the second part of the shunt is present or not.
5C50 SX - http://www.realtimetrains.co.uk/train/Y97573/2019/12/17/advanced.
Regards my thought process for the 5C50 formation - it is below:-
5C50 0649 Exeter New Yard - Exeter SD 0707 - HERE
2P50 0725 Exeter SD - Plymouth 0831 - HERE
1A78 [0710 Penzance - Paddington] PLY 0908 - 0915 a. Pad 1229 - HERE
Additionally, on the way down, 1C36 2200 Paddington - Exeter SD drops off vehicles at Bristol TM, making it a 5 Car, Bristol TM - Exeter SD. (Just to clear that up in my own mind).
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