Brush traction refers to the method of using the friction between a train's wheels and the track to generate movement. This is achieved through the contact of the wheels, which are typically made of steel, with the steel rails. The effectiveness of brush traction depends on factors like the weight of the train and the condition of the track. In addition to traditional trains, brush traction is also relevant in electric trains, where electric motors provide the necessary power. The design of the wheels and the track surface plays a crucial role in maximizing this traction, ensuring safe and efficient travel for passengers and cargo.