First comment in 4 years.
1-99 Main routes that serve metropolitan areas
100-199 Routes that serve estates and small areas
200-299 Not many bus routes , but some longer routes that goes through Industrial areas and business parks.
300-399 North Shields and some Blyth Services
400-499 Alnwick services
500-599 Routes in areas with less coverage and work express services (eg:555)
600-699 Mainly school routes
700-799 Stanley services and short metropolitan services
800-899 Mainly school routes
900-999 Work routes and shopping services (eg:939 is both)
X:Express services
TB:Taxibus
A/B:Alternatives of other routes (eg:62->62B 301->301A)
RE: Route numbers