Originally Posted by TandemGeek
Hmmmm. I'm reminded of Shimano's foray into the air-powered "Airlines" shifting system
Air compresses, much more than steel cables stretch. It's good for go/ no go with some adjustment to how much pressure is applied. Obviously it works well for brakes on larger vehicles. It's also used to shift transmission systems on some yachts, ferries and commercial fishing boats, where the choices are only forward neutral and reverse. I can easily understand why this system failed with more than those three choices.