Towline conveyors are embedded in the floor or are low to the ground.
This type of conveyor consists of an embedded track with trolleys carried by chain. Therefore, they require two tracks for a straight run, a live track and a return track. Chain on edge towlines are more flexible as they can make any curve desired.
These towline conveyors are a more cost effective approach to conveying dollies. The cost savings of a chain on flat system come from a simpler chain and can return in the same track that is conveying the product. A chain on flat cannot, however make curves.