There are several types of overhead conveyor used in factories. A light duty line is common for small parts and simple transfer work. A powered line is used when the goods need continuous movement. A power and free line is useful when parts must stop or wait at some stations.
The right choice depends on load weight, process time and workshop shape. A long line may need more than one drive unit. A line with many turns needs enough space, so the track can run smoothly without forcing the carrier path.