Hello Annie,
Here's a quick fix involving an A5. During 1925 No.1712 brings a main line four-set in to Durham on a down stopping passenger working.
The leading D130 BT3 remains in crimson lake but has LNER lettering and numbering. Works were still turning out new build carriages in Crimson Lake during the first half of 1923 and I doubt it was different for older carriages going through works visits. The D127 Third and trailing D18 BT3 have gained lined teak but the D7 CL remains both in Crimson lake and retains N.E.R. lettering. This mixture of liveries as rolling stock transitions from one to the other can still be seen on the railway today.