Have you checked the train times?
It was one an hour, but they now put a second one on once a day for the commuters. I could do it but I'd be relying solely on the old boneshaker to be reliable. I'm assuming some of the trains will be delayed when the metro system goes down.
*nostaligia warning*
Used to drive into Newcastle 20 years ago for work and apart from 5 minutes of queueing you could get straight in and parked for free if you were ITK. Since they strangled all the rat runs and shut the high level to cars its appalling. Occasionally have to go in for work from Team Valley and you can easily wait half an hour just to cross the Tyne bridge off Gateshead flyover