Fawkes Cat
Established Member
- Joined
- 8 May 2017
- Messages
- 2,981
As an aside, we seem to be tackling the question from the wrong end viz think of a station and then see if it is unique in being served by one (and only one) class of train. Surely it's easier to think of a class and then think of whether any of the stations served by it are only served by it - and then count the number of stations that meet that criterion, and if the answer is one, you have an answer to this question.