Like all Shire books this is a fine introduction to a neglected subject, since railways and their predecessors have a long and important part in Britain's industrial history. It's also one which is hardly covered by the enthusiasts. As usual it's great value, but let down by the lack of a list for further reading.
I would admit that most stuff written on the subject will be in specialist journals: perhaps the authors might consider a larger but still "popular" work on the subject. i'm not aware of anything other than "Early Wooden Railways" of c.1970