The book is numbered No. 1230 and came out of Wilmington N.C. in 1957. This collectible pertains to Air Brake Equipment on diesel-electric locomotives for Supervisors, Enginemen, and Air Brake Repairmen of the Atlantic Coast Line RR Co. USA.  It does not contain any California Prop 65 warnings. This paper is a great addition to any railroadiana and train enthusiast collection. This book is extremely informative and at the time was at the utmost importance in safe train operations.  There are 187 numbered pages and I would give it ,in all, a 9.5 of ten, only because there is a few inpressments on back cover and outer binding is great with little wear. It's the best one like it that I seen during my searches on it. Thanks for looking, have a nice day/night.