I thought I had a good understanding concerning the earliest steam engines that came before ‘Rocket’, but this very well researched book surprised me more than once with early steam locomotives I knew nothing about. This is a book that I can heartily recommend to anyone who has an interest in 19th Century archeology and the inner workings of early steam locomotives. This is a book that I've wanted for a good while now and I'm delighted to have it on my bookshelf.