The 10.06 and 14.06 from Kings Cross to Newark are booked as electric loco on as part of a single diagram. 12.06 and 16.06 are HSTs as are the intermediate York stoppers in between. The exception is the 7.06 to York hauled by a 91. Last week 90020 and 039 were doing the Newarks.
Correct but in practice the 10:06 is a 91, with the 14:06 being a 90
If it solves any confusion as to what's worked by a HST, what's worked by a 90 and what's worked by a 91 here's the list of Newark/York stoppers from Kings Cross and both what's booked to work then and what usually works them:
07:06 York (91)
09:06 York (HST)
10:06 Newark (91)
11:06 York (booked 91 but until the first 800 entered service this week was fairly often worked by a HST)
12:06 Newark (booked HST but usually worked by a 90)
13:06 York (HST)
14:06 Newark (booked 91 but usually worked by a 90)
15:06 York (HST)
16:06 Newark (booked HST but usually worked by a 90)
19:06 Lincoln (HST