It is an interesting route to travel on. I saw seals along part of the line last year. I think though that the trains should be 3 or 4 coaches long rather than 2, as sometimes several tour groups make block reservations and one train every seat was prebooked, apart from a few in the very front first class bit, I asked the conductor if it was Ok for me to sit there and he allowed it, but a longer train with at least one unreserved coach would have been good. Wick to Inverness would have been a long way to Stand.
When the trains were steam and diesel loco hauled, how many coaches did each of the sections to Wick/Thurso consist of after splitting/connecting at Georgemas.
I think sometimes in the not too distant past some services north from Inverness split at Dingwall, 1 portion going to Kyle and the other to Thurso/Wick. (I think some thing similar may happen on the Oban/Fort William-mallaig services too?)
There was also a further line running south for a few miles from Wick, I think to a seaside town called Lybster? there are also rail tracks further north, on the Road to John of Groats which I think is to do with the Oil/gas industry and may not be connected to the national rail network.