(26 Apr 2014, 7:07 am)danpick wrote the morpeth & dunston stoppers interwork with each others so the 12:01 from metrocentre to morperth does the 13:31 metrocentre to newcastle and on them run its a pacer and sprinter
http://www.prar.fsnet.co.uk/diagrams.html
A couple of years old, but looking at the journeys I have done over the last year, allocations seem to be pretty much the same.