The carriage is what houses the โbrains and musclesโ of the stairlift. The motor gearbox, electronics, most of the safety switches and the batteries are within the carriage. It is basically the hood of your car where the engine is kept. Stannah stairlifts use a rack and pinionย gear system. Call now for a free no-obligation in-home evaluation with a guaranteed price in writingย 888 542-3834ย (Click To Call).