Combined cycle powered railway locomotive

Power plant concept

A combined cycle powered locomotive is a patented idea to use two primary movers, a gas turbine with a steam turbine to gain the efficiency of a combined cycle power plant or a combined gas and steam engine. Steam locomotives were tested in the past but were not ideal for low speeds, and gas turbine locomotives (GTELs) were used by Union Pacific until the 1970s. Combined cycle power uses the heat from the gas turbine to make steam from the water to turn a steam turbine, instead of that heat getting exhausted out and wasted. Engine efficiency for combined cycle can achieve 60% compared to diesel motors' 45% efficiency.

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