It wasn't Rocket science by Mike Norman

Summary

A story of a grandson's quest to uncover the truth about one of the pioneers of the locomotives whose efforts swept the Industrial Revolution into the pages of history. The Stockton and Darlington Railway that he worked for was the pioneering first railway in the world, and he saved it from going off the rails...

Told against the backdrop of the famed Chicago World's Fair that brought the world to the united states of America, Superintendent Timothy Hackworth Young brings his own experience and knowledge of locomotive transport to bear. The inventions and skill of his grandfather left others standing in his shadow and, with the support of the prestigious Baltimore and Ohio Railroad, he is due his rightful place in history.