Today’s case involves the question of whether a doctor’s deposition testimony equivocating that throwing a railroad track switch caused the plaintiff’s injury can be contradicted by the doctor’s subsequent affidavit that the switch pull indeed caused the railroad conductor’s injury.In Kopplin v. Wisconsin Central Ltd., d/b/a CN, 2019 WL 407085 (7th Cir. 2019), plaintiff Jeffery Kopplin, a Wisconsin Central Railroad conductor, claimed he injured one of his elbows throwing a broken snow-covered …