This is a "rabbit-hole" story. Like every major city, my hometown, Chicago, has stories and then there are legends. It's just that given Chicago's, shall we say, colorful past, even by those standards, this one is a doozie.
International Harvester built its first school bus and the company and it's successor company Navistar continues to make them to this day. But when The Ford Motor Company introduced its school bus version of a Model T, the game changed completely.