Mechanics. Smooth motion.
The combination of LEGO® spur gears and worm gear ensure the slow, smooth motion, even with the load of 40 oz. (1.1 Kg). With the factor of ×52, the mechanics make it possible to use an ordinary motor while ensuring the carriage takes two hours to move from edge to edge. Sunrise? Night traffic? Snail on a morning trip? You name it.