A set of gears connected the wheels of the carriage with the wooden drummer, on the same principle as that of the modern automobile odometer. 车内装有一套具有减速作用的传动齿轮,是近代里程表和减速装置的先驱。
People inside of their vehicles are crushed when the road above falls in an earthquake and crushes their vehicles. 当发生地震时,在车内逃生的人会因路边坠落的物体砸伤。