Here's the original Minneapolis Star caption published on June 24, 1960:

INDUSTRY AT ITS BEST can be found these days in the woodworking shop at Jordan junior high school where seven youths are at work on their soap box racers. The boys are Jack Fyten, 13, 3218 N. Lyndale Av.; Tim Fair, 13, 3035 N. 6th St.; Larry Thompson, 13, 5530 N. Girard; Lee Fjeld, 12, 2710 N. Aldrich Av.; Randy Johnson, 13, 3446 N. Washburn Av.; Bob Quigley, 14, 3230 N. Bryant Av., and Dennis DeMan, 12, 2309 Walton Pl. Instructor is James Clinger of the junior high. The Minneapolis derby will be July 9 at 12:30 p.m. at St. Anthony Blvd. and NE. Johnson St. Entries, which close Saturday, can be made with any Chevrolet dealer.

These industrious girls were building a pushmobile to race in a Minneapolis Tribune-Park Board derby in July 1940. (Photo courtesy mnhs.org)

Competitors in a variety of contraptions lined up for an Aquatennial pushmobile race in 1940. (Photo courtesy mnhs.org)

Here's the original Minneapolis Tribune caption published on June 18, 1960:

The Abbott brothers of 3344 Harriet Av. are all ready to race in the 1960 Minneapolis Soap Box derby July 9. Walter 15 (left); Michael, 13; and Joel, 12, entered last year's derby, too, with Michael winning his first race. (Photo by Don Black)