This is an enquiry into bus route numbers used in Newcastle-upon-Tyne mainly the X prefix numbers. There are many such routes but I am not convinced that they are all express routes. The Nexus timetables of the Stagecoach services X34, X47, X63, X77,:X78,X79,:X82, X87 and X88 are not helpful indicating whether they are express/limited stop so why the X prefix? I have no connection to the city so forgive my ignorance!