Demonstrates how the crane, bulldozer, dump truck, and other construction machines all play a part in building a new park.Big Machines by Karen Wallace shows diggers, dump trucks, and other machines as they transform an old factory site into a park for the community.Demonstrates how the crane, bulldozer, dump truck, and other construction machines all play a part in building a new park.Big Machines by Karen Wallace shows diggers, dump trucks, and other machines as they transform an old factory site into a park for the community.