Modifications to the RSI Towline is simplicity itself. To modify an existing RSI Towline, a few items need to be accomplished.
1: Design change of conveyor. If  the conveyor has multiple drives, this is critical.
2: Order the necessary components for the conveyor.
3: For on-floor conveyor, chalk the centerline of the new conveyor. move any obstacles in the way.
4: For in-floor system, have trench made for new section.
5: Cut chain and add track and or turns. 
6: Back fill trench if this is an in-floor system.
7: install delay stations, if required.
8: Install chain and connect to existing.
9: Add extra carts, if needed.
10: Run system.