I was wondering if anyone could tell me how much this book that I have is worth. I have had it for years and just now noticed it is actually signed by the author. The cover is not in good shape but all the pages are there. It is: Standard American Locomotive Engineering by Calvin F. Swingle 1907 Complete in All Its Branches It then says on the wrapping cover: Breakdowns, Railway Signaling, Valve Setting, Air Brake With Questions and Answers I myself worked for Southern Pacific in Maintenance of Way for 20 years till the lay-offs from the severly mis-managed company became too much for me to endure. Someone bought this book for me at an antique store years ago.