Tractors can be that, or combines, or just the truck to pull other tools, plows, trailers.
If a child, or an adult, can get excited about a piece of equipment, try to take time to watch those machines in action, if you get a chance. Not too close; from a safe distance, or from inside your car, if you can. When you're out, find people digging, building, repairing—replacing signs with a crane, or going up in a cherry-picker to change streetlight bulbs—do it for your kids or for yourself.
photo by Holly Dodd