(12 Jun 2014, 7:28 pm)Marcus wrote There used to be a Chester service to Witton Gilbert from Newcastle (21B), and I think that sort of got 'morphed' into the X25 with the Langley Park stretch. Not sure about South Shields, as far as I can remember, the 551 is now the 50, but it may have followed a different way from Chester to Durham.
The 551 used to run south shields to washington to chester to scariston and the x50 used to be south shields to durham via washington and chester. Merging later to be come the 50.
We also had the x20 south shields to durham via sunderland. Fantastic service express to sunderland from either direction