Thanks for your very informative reply. I presume only 4 out of 12 2 car 196s in use is for preparing to lose 6 due to East West reopening. Do you have any idea how many diagrams there are on the Shrewsbury route now there are extra services? Thanks again.
Seems to be full house today with all thirteen diagrams filled (except the new TS605).
Regarding the new (little) TS605 diagram which I have not noticed in use, at a guess I would say it is for a unit to go out on a simple trial post any deport work.
To answer your question - From Part Time Spotter it looks like there are now six diagrams per day for Shrewsbury (4 x 4car and 2 x 2car).
Yes a remarkably low usage of 196/0s (the 2car units) with only four out of twelve generally in use. This can be explained by the six (it is believed) set aside for East West Rail (iirc coming late this year at the earliest - its mentioned up thread iirc).
Then there is the two 196s allegedly for the Camp Hill service (which I feel will happen sooner then EWR). I assume 2car but I feel I am wrong. That would make 12 out of 12 so if that is the case I am tempted to guess the two Shrewbury 196/0 (2car) diagrams will be 196/1s (4car) eventually.
Note also the most regular aberration is pairs of 196/0s (ie 2car) out on a four car diagram.
I have never seen 196113 or 196114 reported as doing anything plus 196112 is not out as much as the others.
Currently the norm is thirteen units out of twentysix units out per day so 50%. Gets higher of course if two 196/0s (2car) cover a single 196/1 (4car) diagram - which is rare. I think that peaked a while back with two diagrams covered by pairs.
(Bit of a rushed reply as I am orf out.)