Although I've never been there, I imagine that Ribblehead Viaduct is in a very remote location. You must have got up extremely early to get the shot, which is a beauty. Funnily enough I have just written a post which is related to early railways. You will find it here. http://bit.ly/2HwNnqu All the best.
RE: Those victorians sure knew how to travel in style, Yorkshire Dales