Truck riggings for a double truck that holds a single trolley car. A truck is the mechanism that consists of the trolley wheels and motors. This type of rigging was used in the early twentieth century. This mechanism allows the trolley to pull an extraordinary amount of weight: between 2,000 and 5,000 pounds. (P) is a lever that is secured to the car body by fulcrum (f) which is stationary. (C, C) are two pieces of metal bent to suit the movements of the trolley car.
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International Correspondence Schools A Textbook on Electric Lighting and Railways (Scranton, PA: International Textbook Company, 1901)