Of what I know of UK practice, and a bit of US practice, its exactly that. Some sidings are only operable from a certain direction.
If you want something interesting to do on google maps, search the Matt Brewing Company in Utica, NY, USA. Theyre still railserved and Ive had quite a bit of fun trying to figure out how to actually get from there to any mainline as the area is peppered with defunct sidings, old rail served industries, and different arrangements of sidings and access.