Cloth sails were used to catch the wind to move a ship through the water.
VOA: special.2009.12.23
But if a big gust of wind pushes the ship too far to the left, the solution is not to figure out a way to generate an equally-sized gust of wind to push the ship back in the other direction.
But the Albula steepens quickly, and the river disappears into a dramatic ravine, forcing the train to criss-cross the gorge, creaking like a sailing ship in a full-bellied wind.
Man, this all sounds a little too weird to be true, but apparently Wind River's VP of Marketing told LinuxDevices that they do have at least one customer who expects to shipa phone in the US running Wind River Linux before Christmas.