(05 Jan 2019, 9:36 pm)S813 FVK wrote Double deckers wouldn't get very far on the X6/X7 anyway with that low bridge near Seaham. Unless they were to divert around it of course.Someone correct me if I'm wrong but I think Scania OmniDekka's are 13"-11" and the bridge in question is 14"-3" so in theory those could be used if they were available (excluding 3995/6), Arriva have sent Darlington's Sapphire Enviro 400's under there on the X21 before: https://flic.kr/p/G2psSH
Edit: never mind, the above reply confirms it