I agree completely . Before de regulation in 1986 it was 1 - 99 Newcastle and Gateshead, 100 - 199 Sunderland and Washington 200 - 299 Sunderland to East Durham, 300 - 399 North Tyneside, 400 - 499 South East Northumberland including services to Newcasltle, 500 - 599 South Tyneside, 600 - 699 West Gateshead & into Northumberland, 700 - 799 County Durham 800 - 899 independent operators, 900 - 999 Schools and works services, X services fast or limited stop. There was a few services that didn,t follow this mainly the longer distance services up the Northumberland coast which were 500's but not many.