Explanation: Electric Traction Systems Definition: Electric traction refers to the use of electrical energy for driving locomotives, trams, trolleybuses, or other vehicles. It is a key technology in modern transportation systems, offering efficient and sustainable energy utilization compared to traditional methods like steam or diesel traction. Working Principle: Electric traction systems use electric motors powered by electricity, which can be sourced from overhead wires, third rails, batteries, or onboard power generation systems.