(23 Apr 2019, 9:57 am)big mac wrote Because of the x20 interworking with the x6/x7, I think on GNE's Facebook page the sentence "Due to delays on the previous journey the xx:xx X6 journey will not be operating" will appear quite a few times.
I thought that when the 20 was extended to Shields but reliability didn't seem to become any worse. I suppose the X6/X7/X20 will be ok if it is given sufficient layover times at each end.