(01 Nov 2020, 2:51 pm)Adrian wrote Go North East 8 and 50 is a good example:
8 towards Washington departs at xx:14 and xx:44
50 towards Washington departs at xx:18 and xx:48

Arriva on an evening between Durham - Coxhoe:
58 departs Durham at xx:10
X12 departs Durham at xx:20

Isn't there a 56 from Durham at xx:50? The 58 came later I think and went into the same departure slot at the Scarlet Band 58A did.