(04 Aug 2014, 8:51 pm)alanf wrote Which part of the route is the 10 mile bit? Im guessing its not Billingham to Hartlepool. I would of thought that bit could be every half hour and send every other back to Park End or wherever it came from thereby increasing the frequency on the busy bit of the route

Norton to Middlesbrough is the busy bit, the rest isn't amazing. Like you say it doesn't justify the 15 min frequency beyond Owington Farm, though there are a few busy ones (the 1515ish from Hartlepool used to be a twat as you hit the college and then 2 schools in Hartlepool, finishing off with Bede College in Billingham for good measure)