(28 May 2017, 9:24 pm)S813 FVK wrote But the 'X' has formed part of the identity for each service regardless of whether they are expresses. It seems daft to not do it in this case, sort of dilutes the brand even more.
The 306/308 retained their 3xx so they remain easily identifiable as the coastal routes, and not the limited stop X routes. The 306/308 were MAXed to standardise the Blyth to Newcastle corridor.