This could best be described as a general book and not specific to any line or railway company. As it says its a nostalgic look at a byegone age. I enjoyed reading it and had not seen the majority of the pictures before. A lot of the pictures have a lot of detail such that you can pick it up again and again. This will not suit you if you want specific detail but if you want a good railway read I recommend it. I went on to buy along country lines if thats any recommendation.
Given that there must be a finite limit to the number of photographs surviving, even in private collections, this is an excellent source of pictorial and other information for model makers. Mr Atterbury knows his subject well and is an excellent communicator; I now have 3 of his books and all are good resources as well as enjoyable reading.
Can't fault this book at all, fantastic photographs of the many branchlines, and very informative. An absolute unique book that anyone remotely interested in Britain's lost railways will find impossible to put down.