(07 Sep 2015, 8:49 pm)northern156 wrote Explorers are not valid between Metrocentre and Newcastle.
I appreciate that's the official line and for all intents and purposes they're not, however, I've often used Explorers to travel between Sunderland and Metrocentre without being challenged.
I think the guards presume Explorers are the same as Day Rovers which are, of course, valid on services between Sunderland and Blaydon.