(03 Dec 2014, 8:07 pm)Andreos1 wrote Upto late 90's/early 00's
Fozz might know for sure. Have a look in the Bygone section - the old timetables might be in there.
Was it not either the 154/254?
I know at least one of those services (if not both) ran from Sunderland to Durham via Seaham and both could be considered forerunners to the current 265 service.