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A tram is an enclosed carriage intended for public transportation, powered by electricity, and designed to run on rails located in the street. Trams are also known as streetcars, trolleycars, or trolleys, and they were once abundant in metropolitan areas around the world.
EGR is a very useful technique for reducing the NOx emission. In the present research, experimental investigations were conducted to study the effect of EGR on performance and emissions of a diesel engine. EGR displaces oxygen in the intake air by exhaust gas re-circulated to the combustion chamber.