(15 Sep 2020, 6:12 pm)tcts24 wrote There's probably rarely any real logic to choosing route numbers. There are still a few 1XX services in the Wear Valley, 2xx routes in East Durham and 7xx numbered routes around Chester.
There's definitely some logic to Arriva Northumbria's route numbers tbf.
1 - 13 (Blyth routes)
14 - 19 (Morpeth / Alnwick Routes)
20 - 39 (Ashington Routes)
40 - 49 (Great North Road Services)
50 - 59 (N Tyneside / Cramlington Services)
306, 308, 685 (Legacy Routes that stuck)
with some even further
43, 44, 45, 46, 47 (Gosforth)
51, 52 (Coast Road)
54, 55 (FLE to Newcastle)
57, 58 (East Cramlington Hospital)
X7, X8, X9, X10, X11 (Blyth Expresses)
X20, X21, X22 (Ashington Expresses)
X14, X15, X16, X18 (Morpeth Expresses)
The only odd one out is the X30