However, tow trains can also be utilized
with non-cyclic schedules and varying routes. Obviously, tow train
routing and scheduling are heavily interdependent. As a basic objective
the number of required tuggers can be minimized, so that,
e.g., labor costs are reduced. On the other hand, part inventories at
the stations need to be reduced, because of the limited space. As
constraints, routing and scheduling need to consider the limited
tugger capacity and the part demands of the stations.