(23 Jul 2014, 10:30 pm)benambro wrote On that note you can't use them on the X9/X10, so I doubt they'll do thatYou can (as I regularly do use mine).
You can't purchase a 90p single on board the TTX with your Get Around Key Card but a £3.75 Get Around day ticket is perfectly valid.
As it's unlikely that a customer is actually going to live on the route of the TTX and would have to purchase a 90p single to and from part of the route, they would incur a cost of £3.60 regardless - just by purchasing single tickets - and most would have opted for the extra 15p for a day ticket if so anyway.
The WTX does accept 90p singles, and I'd guess that if something was to come of a Durham - Middlesbrough express, it would too. If nothing else, it encourages further custom.
To add my own thoughts on the discussion, ever since the WTX was implemented, I've thought it would be good for GNE to at least have an hourly service going up and down between the two places, allowing Middlesbrough to be easily linked with Go North East services to Bishop Auckland, Stanley, Consett, etc.