I think they do try and keep 6941 on there with it being in fleet livery.
Likewise the 16:20 X21 is usually 3965, running onto the 17:40 6 to Newcastle and 18:55 6A to Stanley afterwards.
16:50 was usually 6010, though that hasn't been the case as of late - almost as if they don't want it used on the X21.
RE: Go North East: Latest News & Discussion - June 2019