I've only visited the GCR twice, in 2014 on a July Saturday and today (29th) at a gala. I enjoyed today much more because there was a lot more happening and the double track set up lets you do more interesting things from an operational point. The trains on that day in 2014 would only have been about 1/3 full at most which seems odd to me compared to other railways that I've visited on summer saturdays and my own experience of the SVR. The scenery, let's be honest, isn't particulary interesting and the stations seem to be a bit a way from things, well maybe not Loughborough but the others yes. Thus my gut feeling is that ordinary folk probably just have a quick ride on train and then go elsewhere rather than spending a whole day on the railway. So the NRM outstation? Well, it's another reason to be nearby/at the railway so you would imagine it would increase the numbers but it really depends on how successful the outstation is, if it happens.