Yeah they seemed to be an express service towards Preston and then became a stopper for the rest. I remember the 10:00 being a single voyager which is quite crazy for almost a 6 hour journeyI hadn't noticed that, from the December 2019 timetable:
9M53 10:00 Glasgow-Euston was Penrith then Preston
9M55 12:00 Glasgow-Euston was Carlisle then Lancaster
9M84 14:00 Glasgow-Euston was Oxenholme then Preston
9M59 16:00 Glasgow-Euston was Oxenholme then Preston