Had a nice walking trip from Horton in Ribblesdale to Ribblehead the other week using the Northern service. When planning the walk looking at the timetable (kind of a necessity to not be stuck in Ribblehead for a couple of hours, even if the pub is very nice) a question occurred to me about frequencies on the line. During weekdays the line has a roughly two and a half hour frequency during the day time running from Carlisle to Leeds but with a 4 hour gap between 2 services at Ribblehead: 0947 1219 Gap IE23 Passes at 1518 http://www.realtimetrains.co.uk/train/Y21401/2018/08/21/advanced 1613 1744 However, in that gap a Northern service runs through as an express: http://www.realtimetrains.co.uk/train/Y21401/2018/08/21/advanced Does anybody know the reasoning behind running some of the services as stoppers and expresses? The timings are within 20 minutes of each other (2hrs 49 stopper - 2hrs 34 for express) and the path doesn't seem to have any clashes with freight services that I can find on RTT. The express services do seem to lengthen the gaps at the intermediate stations significantly without a huge time saving.