Paddle Steamer Waverley on Instagram: "Waverley is powered by her remarkable triple expansion steam engine which delivers 2,100 horsepower. Steam is produced in two boilers by burning marine gas oil (similar to diesel). Steam passes from the boilers to the engine and expands through three cylinders of increasing size – high pressure, medium pressure, and low pressure – extracting energy at each stage. This step-by-step expansion makes the engine more efficient. Each cylinder drives a piston, whi