If the control boxes are not set correctly, the units will jam up and back up the lines.

The image shows the control box next to the rework line where it meets the inner line and the crossover to the outer line. In the background, next to the computer, is the control box for the crossover, inner and outer lines.
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This is the rework control box.
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  * The "Chain Transfer" button should be illuminated
  * The "Load Release to Chain Transfer" switch should be set to **Auto**
  * The "Destination" switch should be set to **Outer Mainline**


This is control box for the crossover, inner and outer lines
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  * The "Outer Chain Transfer" and "Inner Chain Transfer" should both be illuminated
  * The "Crossover Mode" switch should be turned to the left
  * The "Outer Mainline Load Release" and "Inner Mainline Load Release" should both be set to **Auto**

FIXME we're tricking the system into behaving how we want by covering photo eyes at the end of the inner mainline.  Find out which ones do what and when they need to be covered.