(23 Apr 2019, 2:37 pm)Dan wrote Because the services are now interworking with the new daytime X20 service - this gives passengers from Holmeside an express option to Durham.
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.... but removes the express option to Peterlee!
(OK, so perhaps I'd far rather be on my way to Durham than to Peterlee!!)
I think talking about "giving passengers ... express option to Durham" is really just smoke and mirrors on a forum such as this, where, from the first half of your answer, it's clear that that's just how it drops out operationally from the new interworking, and that there'll be winners and losers on the passenger front.