In accord with the UTU contract, in March and September all open runs in the system are placed up for bid by seniority choice, regardless of Division. System shake-up – Since the eighties this procedure is no longer in effect. This consisted of placing up for bid all runs in system whether open or bid-in by an operator. The elimination of this practice helped stabilize the system and Operation’s management goal. Weekly bid – Within each Division all open runs are placed for bid by seniority choice.