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Low Frequency Diesel Engine Idling With

High Pitched Electric Motor Whirring And

Rumbling Steam Train Whistle Building In

Vintage Motorcycle Engine Revving And Settling

Turboprop Plane Spooling Up To Takeoff

Low Frequency Diesel Idle With Intermittent

Sustained Whine Of A High-speed Maglev

Deep Rumbling Of A Vintage Steam

Smooth, Consistent Whirring Of A Futuristic

Throaty Idle Of A Modified Muscle