What this measures: For every trailer work order, days pushed = current due date − original due date (positive = pushed later, negative = pulled in). Work orders are grouped by the period of their original due date — so each bucket answers "how far did we move what was originally scheduled then?" The headline Avg Days Pushed averages only the work orders that moved later. Net movement averages every work order (later, earlier, and unchanged). Trailer lines only (LC, LD, LE, LF, LT, LU, RC, RE).