Steamroller Tonka T-ShirtThis Tonka t shirt shows two young boys playing with a toy Steamroller. A Steamroller is a form of road roller, a type of heavy construction machinery used for flattening compacting surfaces, such as roads or airfields, and is powered by a steam engine. The flattening action is achieved through a combination of the size and weight of the vehicle and the rolls: the smooth wheels and the large cylinder or drum fitted in place of normal road wheels with