Electro-Motive SD24 Demonstrator No. 5579 was built in July 1958 and is shown in the Lower Bay of the Engineering Building. This locomotive has been instrumented for testing and has it's engine exhaust ducted outside the building. Various pressure gauges, manometers, and a fuel scale are visible on the side of the locomotive. The SD24 was rated at 2,400 HP and used the 16-567D3 turbocharged engine.