George Stephenson. The Father of Railroads

Many call George Stephenson the father of railroads, not only in England but throughout the world. Why? He did not build the first locomotive, he did not invent the tracks, and he did not come up with the steam engine. So what did this "father" do? He studied what had been invented before him and built the best locomotive in the world and the first real passenger railway. But above all, he "made" himself.
For younger school age.