No. 97-3961 ARGUED APRIL 14, 1998 DECIDED JULY 17, 1998 Appeal from the United States District Court for the Northern District of Illinois, Eastern Division. No. 97 C 4337 — George M. Marovich, Judge. Stephen A. Murphy, Chicago, IL, Clinton J. Miller, III, Kevin C. Brodar (argued), United Transportation Union, Cleveland, OH, for Plaintiffs-Appellants. Harold A. Ross (argued), Ross Kraushaar, Cleveland, OH, William L. Phillips, Chicago, IL, for Defendant-Appellee Brotherhood of Locomotive Engineers