This book is full of lots of important and valuable information on the building of the Transcontinental Railroad. It is slightly confusing in the beginning, but eventually, all is explained and the reader can read without any more confusion. For anyone who is looking to write a report or just to learn about this awesome railroad, this is a great resource book. Some of the information could have been arranged in a different way so that it would be more easily understood. Kids 12 and up would best understand this book. Overall, this book is a great read for anyone interested in the Transcontinental Railroad!