caption: The image shows a drawing of a steam engine with a wheel, which is a type of traction engine used for traction traction. It has a cylindrical shape with a handle on the side and a spindle at the top. The wheel is connected to the engine and is used to propel it forward. The engine is composed of several components, including a cylinder, a cylinder head, and a cylinder block. The cylinder head is used for the traction of the engine, while the cylinder block and cylinder block are used to control the speed and direction of the traction.