Jackie Joyner-Kersee Center

Jamon Greenwood Jr., 10, and Tremell Kellys, 11, were new to the world of soap box car racing. Both left Sunday's derby, a beloved tradition in the Hill neighborhood of St. Louis, with a new passion. One left with a trophy.

They’re crossing over the Mississippi River for many reasons, but mostly to find faster, cheaper and more consistent testing options.