I asked Swiggy about this because he's old. He didn't have any special training when he drove school bus. He did mention that most of the bus drivers he had growing up were either Farmers or owned auto repair shops.
As far as motorcycles: He considered getting a MC endorsement on his drivers license when they first started requiring it in Indiana. To do so, he would have had to attend a motorcycle riders class run by the state, and it was way out of his budget.