If this book shows all the working part of the 4294, then it is not worth the expense. but if if shows where she worked and all the assignments that she took part in, then it is worth adding to the library. where it worked and was assigned to.. .The 4294 did it share of moving the traffic as well as working in helper service on both the sierra's and Oregon...I saw and photographed the 4294 at Oakridge in helper service....Take the time and go to Sacramento and look this great engine over, its well worth the time....