Going way back to the cool graph in message # 6738, it seems that the delivery time for the second car in each pair of cars is always shorter. This makes me think that they lay them down on the erecting floor in pairs. When the lead car encounters one of the many snags, it resets the clock - but when the problem is solved, the solution goes into the next car faster. Just a theory. It will be hard to test as there is likely a holiday shutdown coming. In any event, the acid test that no new production problems have arisen would be a third car taking no longer than the two cars before it.